06/10/2026
Pitchers Are Throwing Harder Than Ever…
So why are more arms breaking than ever?
Baseball has a problem.
Youth pitchers are chasing velocity.
High school pitchers are chasing recruiting exposure.
Professional pitchers are chasing radar gun readings.
And at every level, elbows and shoulders are paying the price.
What if the problem isn’t velocity?
What if the problem is HOW we’re creating it?
For years, pitching development has focused on making the arm move faster:
❌ More layback
❌ More external rotation
❌ More arm speed
But the arm was never designed to be the engine.
It’s supposed to be the transmission.
The real source of velocity starts at the ground and moves through the body in sequence.
When that sequence breaks down, the arm compensates.
The UCL compensates.
The shoulder compensates.
Eventually, something gives.
In the latest episode of Toe the Rubber: Player Development for All Ages, I explain why the TripleSpin Pitching Philosophy may offer a different solution to baseball’s velocity and injury epidemic.
⚾ Hip Rotation
⚾ Shoulder Rotation
⚾ Hand Path Rotation
Three connected movements.
One efficient kinetic chain.
One goal:
Create MORE velocity while asking LESS from the arm.
Because the answer to the velocity epidemic isn’t less velocity.
It’s learning how to create velocity without making the arm pay the price.
🎙️ Listen to the full episode:
“Is TripleSpin the Answer to Baseball’s Velocity and Injury Epidemic?”
After listening, tell me:
👇 What’s causing more pitching injuries today—
the pursuit of velocity itself, or the way we’re teaching pitchers to achieve it?
An increase of ~20° in forward trunk flexion during the pitching delivery can contribute to higher velocity—but only when it occurs at the right time in the sequence. Within the TripleSpin philosophy (hip → shoulder → arm), this adjustment influences velocity through several key biomechanical mechanisms:
1. Increased Linear Energy Transfer (Momentum Into the Ball)
When the trunk flexes forward, the pitcher’s center of mass continues moving toward the target rather than stalling or rotating off-line.
This creates greater linear momentum into release
More momentum = more energy transferred to the baseball
Reduces “energy leaks” where force dissipates before reaching the hand
👉 In TripleSpin terms:�This is the bridge between rotational force and linear release efficiency
2. Enhanced Kinetic Chain Sequencing (Proximal → Distal Acceleration)
Proper forward trunk flexion allows the pelvis and torso to fully complete rotation before the arm accelerates.
Delayed trunk flexion = energy stays stored longer
Properly timed flexion = late acceleration spike into the arm
Results in higher angular velocity of the shoulder and elbow
This aligns directly with findings from Glenn Fleisig and ASMI research:
Peak velocities must occur in sequence:
Pelvis
Torso
Arm
👉 More forward flexion at the right moment = better sequencing efficiency
3. Increased Shoulder External Rotation (“Layback Window”)
Forward trunk movement helps position the arm to achieve greater external rotation without forcing it.
As the trunk moves forward, the arm “lags” behind
This creates a stretch across the anterior shoulder
That stretch leads to a more powerful elastic recoil (internal rotation)
👉 This is a major contributor to velocity:
Internal rotation is the fastest motion in sports (~7000–9000°/sec)
More efficient stretch = more explosive release
4. Improved Release Point Extension (Closer to Home Plate)
Forward trunk flexion moves the release point closer to the hitter.
Shortens perceived reaction time
Increases effective velocity (the pitch plays faster)
Even a few inches of additional extension can:
Add perceived MPH without increasing radar velocity
Improve command by stabilizing direction through release
5. Directional Stability and Energy Efficiency
When trunk flexion occurs forward (not rotationally off-line):
Keeps force moving toward the target
Prevents “spinning off” or early torso rotation
Allows the arm to work with the body instead of catching up
👉 This reduces:
Arm drag
Late arm stress
Compensatory elbow/shoulder loading
6. Elastic Energy Transfer (Stretch-Shortening Cycle)
The combination of:
Hip rotation
Torso rotation
Forward trunk flexion
…creates a loaded spring effect through the core.
Muscles lengthen under tension (eccentric load)
Then rapidly contract (concentric explosion)
This is the engine of high-level velocity
⚠️ Critical Caveat (Where Most Pitchers Get This Wrong)
More forward trunk flexion is NOT always better.
If it happens too early:
❌ Early trunk flexion leads to:
Loss of hip–shoulder separation
Reduced torque
Arm forced to generate velocity independently
Increased elbow stress (valgus load)
👉 This is where injuries like:
UCL strain
Capitellum compression starts to show up
🔑 TripleSpin Interpretation
The extra 20° of trunk flexion is beneficial only if it occurs AFTER:
Hip hinge is established
Pelvis rotates and stabilizes
Shoulder begins rotational acceleration
Then—and only then—the trunk flexion becomes:
👉 A velocity amplifier, not a compensation
Simple Coaching Translation
The difference comes down to connection vs. disconnection with the ground at the most critical instant of the delivery.
When the back foot acts as a rudder, it maintains a brief, purposeful relationship with the ground that continues to guide the delivery. When it lifts too early and is “in the air” at ball release, that connection is gone—and with it, a layer of control, sequencing, and force efficiency.
1. Ground Reaction Forces Don’t Just Disappear at Foot Strike
Velocity is built from the ground up. Even though the front leg becomes the primary stabilizer at foot strike, the back leg still contributes residual force and directional guidance.
Research from Glenn Fleisig and ASMI shows that:
Efficient pitchers maintain force transfer continuity
Energy flows through the system without abrupt breaks
👉 When the back foot stays connected (lightly, as a rudder):
The system stays “linked” to the ground longer
Force transfer remains smooth and continuous
👉 When the foot lifts early:
You create a break in the kinetic chain
The body must stabilize itself mid-air instead of through the ground
2. Directional Control Through Release
The back foot acting as a rudder helps control:
pelvic direction
trunk path
release point consistency
It prevents:
spinning off
flying open
drifting off-line
👉 With the foot in the air:
There is less ability to correct direction late
Small errors in sequencing become bigger misses at release
3. Center of Mass Stability
At ball release, the pitcher is in a highly dynamic position:
front leg bracing
trunk accelerating forward
arm moving at extreme speeds
The back foot, even with minimal pressure, provides:
a stability reference point
balance through rotation and flexion
👉 Remove it too early:
The body becomes less stable in space
More reliance is placed on the arm to “find” the release
4. Timing of TripleSpin Sequencing
Within the TripleSpin model:
Hip turn
Shoulder turn
Arm delivery
4. The back foot as a rudder helps:
complete the first spin (pelvis) cleanly
allow the second spin (torso) to accelerate properly
set up the third spin (arm) to fire on time
👉 If the back foot leaves early:
The pelvis can lose direction or stall
The torso may rotate early
The arm is forced to catch up
This is where you see:
late arm
excessive layback
increased stress
5. Energy Leak vs. Energy Continuity
Think of the delivery like a chain of energy transfer.
👉 Back foot as rudder:
Energy flows continuously
No abrupt “disconnect”
Efficient transfer into release
👉 Back foot in the air early:
Energy leaks out of the system
Momentum becomes less directed
The arm compensates
6. Deceleration and Injury Implications
The back foot staying connected slightly longer also helps:
control deceleration patterns
prevent violent, uncontrolled finishes
When it lifts early:
the body often spins or falls off to compensate
increases stress on:
elbow (valgus load)
shoulder (internal rotation stress)
⚠️ Important Clarification
This does NOT mean the back foot should stay planted or push hard late.
That would turn it into an anchor—which is just as problematic.
The ideal is:
👉 Light, guiding contact that releases naturally AFTER energy has transferred forward
🔑 Simple Coaching Translation
“Keep the back foot connected just long enough to guide the delivery—�not long enough to hold it back.”
The Big Picture
The back foot as a rudder gives you:
better direction
better sequencing
better stability
better energy transfer
better command
The foot in the air too early gives you:
disconnection
timing breakdowns
arm compensation
increased injury risk
An increase of ~20° in forward trunk flexion during the pitching delivery can contribute to higher velocity—but only when it occurs at the right time in the sequence. Within the TripleSpin philosophy (hip → shoulder → arm), this adjustment influences velocity through several key biomechanical mechanisms:
1. Increased Linear Energy Transfer (Momentum Into the Ball)
When the trunk flexes forward, the pitcher’s center of mass continues moving toward the target rather than stalling or rotating off-line.
This creates greater linear momentum into release
More momentum = more energy transferred to the baseball
Reduces “energy leaks” where force dissipates before reaching the hand
👉 In TripleSpin terms:�This is the bridge between rotational force and linear release efficiency
2. Enhanced Kinetic Chain Sequencing (Proximal → Distal Acceleration)
Proper forward trunk flexion allows the pelvis and torso to fully complete rotation before the arm accelerates.
Delayed trunk flexion = energy stays stored longer
Properly timed flexion = late acceleration spike into the arm
Results in higher angular velocity of the shoulder and elbow
This aligns directly with findings from Glenn Fleisig and ASMI research:
Peak velocities must occur in sequence:
Pelvis
Torso
Arm
👉 More forward flexion at the right moment = better sequencing efficiency
3. Increased Shoulder External Rotation (“Layback Window”)
Forward trunk movement helps position the arm to achieve greater external rotation without forcing it.
As the trunk moves forward, the arm “lags” behind
This creates a stretch across the anterior shoulder
That stretch leads to a more powerful elastic recoil (internal rotation)
👉 This is a major contributor to velocity:
Internal rotation is the fastest motion in sports (~7000–9000°/sec)
More efficient stretch = more explosive release
4. Improved Release Point Extension (Closer to Home Plate)
Forward trunk flexion moves the release point closer to the hitter.
Shortens perceived reaction time
Increases effective velocity (the pitch plays faster)
Even a few inches of additional extension can:
Add perceived MPH without increasing radar velocity
Improve command by stabilizing direction through release
5. Directional Stability and Energy Efficiency
When trunk flexion occurs forward (not rotationally off-line):
Keeps force moving toward the target
Prevents “spinning off” or early torso rotation
Allows the arm to work with the body instead of catching up
👉 This reduces:
Arm drag
Late arm stress
Compensatory elbow/shoulder loading
6. Elastic Energy Transfer (Stretch-Shortening Cycle)
The combination of:
Hip rotation
Torso rotation
Forward trunk flexion
…creates a loaded spring effect through the core.
Muscles lengthen under tension (eccentric load)
Then rapidly contract (concentric explosion)
This is the engine of high-level velocity
⚠️ Critical Caveat (Where Most Pitchers Get This Wrong)
More forward trunk flexion is NOT always better.
If it happens too early:
❌ Early trunk flexion leads to:
Loss of hip–shoulder separation
Reduced torque
Arm forced to generate velocity independently
Increased elbow stress (valgus load)
👉 This is where injuries like:
UCL strain
Capitellum compression starts to show up
🔑 TripleSpin Interpretation
The extra 20° of trunk flexion is beneficial only if it occurs AFTER:
Hip hinge is established
Pelvis rotates and stabilizes
Shoulder begins rotational acceleration
Then—and only then—the trunk flexion becomes:
👉 A velocity amplifier, not a compensation
Simple Coaching Translation
The difference comes down to connection vs. disconnection with the ground at the most critical instant of the delivery.
When the back foot acts as a rudder, it maintains a brief, purposeful relationship with the ground that continues to guide the delivery. When it lifts too early and is “in the air” at ball release, that connection is gone—and with it, a layer of control, sequencing, and force efficiency.
1. Ground Reaction Forces Don’t Just Disappear at Foot Strike
Velocity is built from the ground up. Even though the front leg becomes the primary stabilizer at foot strike, the back leg still contributes residual force and directional guidance.
Research from Glenn Fleisig and ASMI shows that:
Efficient pitchers maintain force transfer continuity
Energy flows through the system without abrupt breaks
👉 When the back foot stays connected (lightly, as a rudder):
The system stays “linked” to the ground longer
Force transfer remains smooth and continuous
👉 When the foot lifts early:
You create a break in the kinetic chain
The body must stabilize itself mid-air instead of through the ground
2. Directional Control Through Release
The back foot acting as a rudder helps control:
pelvic direction
trunk path
release point consistency
It prevents:
spinning off
flying open
drifting off-line
👉 With the foot in the air:
There is less ability to correct direction late
Small errors in sequencing become bigger misses at release
3. Center of Mass Stability
At ball release, the pitcher is in a highly dynamic position:
front leg bracing
trunk accelerating forward
arm moving at extreme speeds
The back foot, even with minimal pressure, provides:
a stability reference point
balance through rotation and flexion
👉 Remove it too early:
The body becomes less stable in space
More reliance is placed on the arm to “find” the release
4. Timing of TripleSpin Sequencing
Within the TripleSpin model:
Hip turn
Shoulder turn
Arm delivery
4. The back foot as a rudder helps:
complete the first spin (pelvis) cleanly
allow the second spin (torso) to accelerate properly
set up the third spin (arm) to fire on time
👉 If the back foot leaves early:
The pelvis can lose direction or stall
The torso may rotate early
The arm is forced to catch up
This is where you see:
late arm
excessive layback
increased stress
5. Energy Leak vs. Energy Continuity
Think of the delivery like a chain of energy transfer.
👉 Back foot as rudder:
Energy flows continuously
No abrupt “disconnect”
Efficient transfer into release
👉 Back foot in the air early:
Energy leaks out of the system
Momentum becomes less directed
The arm compensates
6. Deceleration and Injury Implications
The back foot staying connected slightly longer also helps:
control deceleration patterns
prevent violent, uncontrolled finishes
When it lifts early:
the body often spins or falls off to compensate
increases stress on:
elbow (valgus load)
shoulder (internal rotation stress)
⚠️ Important Clarification
This does NOT mean the back foot should stay planted or push hard late.
That would turn it into an anchor—which is just as problematic.
The ideal is:
👉 Light, guiding contact that releases naturally AFTER energy has transferred forward
🔑 Simple Coaching Translation
“Keep the back foot connected just long enough to guide the delivery—�not long enough to hold it back.”
The Big Picture
The back foot as a rudder gives you:
better direction
better sequencing
better stability
better energy transfer
better command
The foot in the air too early gives you:
disconnection
timing breakdowns
arm compensation
increased injury risk
An increase of ~20° in forward trunk flexion during the pitching delivery can contribute to higher velocity—but only when it occurs at the right time in the sequence. Within the TripleSpin philosophy (hip → shoulder → arm), this adjustment influences velocity through several key biomechanical mechanisms:
1. Increased Linear Energy Transfer (Momentum Into the Ball)
When the trunk flexes forward, the pitcher’s center of mass continues moving toward the target rather than stalling or rotating off-line.
This creates greater linear momentum into release
More momentum = more energy transferred to the baseball
Reduces “energy leaks” where force dissipates before reaching the hand
👉 In TripleSpin terms:�This is the bridge between rotational force and linear release efficiency
2. Enhanced Kinetic Chain Sequencing (Proximal → Distal Acceleration)
Proper forward trunk flexion allows the pelvis and torso to fully complete rotation before the arm accelerates.
Delayed trunk flexion = energy stays stored longer
Properly timed flexion = late acceleration spike into the arm
Results in higher angular velocity of the shoulder and elbow
This aligns directly with findings from Glenn Fleisig and ASMI research:
Peak velocities must occur in sequence:
Pelvis
Torso
Arm
👉 More forward flexion at the right moment = better sequencing efficiency
3. Increased Shoulder External Rotation (“Layback Window”)
Forward trunk movement helps position the arm to achieve greater external rotation without forcing it.
As the trunk moves forward, the arm “lags” behind
This creates a stretch across the anterior shoulder
That stretch leads to a more powerful elastic recoil (internal rotation)
👉 This is a major contributor to velocity:
Internal rotation is the fastest motion in sports (~7000–9000°/sec)
More efficient stretch = more explosive release
4. Improved Release Point Extension (Closer to Home Plate)
Forward trunk flexion moves the release point closer to the hitter.
Shortens perceived reaction time
Increases effective velocity (the pitch plays faster)
Even a few inches of additional extension can:
Add perceived MPH without increasing radar velocity
Improve command by stabilizing direction through release
5. Directional Stability and Energy Efficiency
When trunk flexion occurs forward (not rotationally off-line):
Keeps force moving toward the target
Prevents “spinning off” or early torso rotation
Allows the arm to work with the body instead of catching up
👉 This reduces:
Arm drag
Late arm stress
Compensatory elbow/shoulder loading
6. Elastic Energy Transfer (Stretch-Shortening Cycle)
The combination of:
Hip rotation
Torso rotation
Forward trunk flexion
…creates a loaded spring effect through the core.
Muscles lengthen under tension (eccentric load)
Then rapidly contract (concentric explosion)
This is the engine of high-level velocity
⚠️ Critical Caveat (Where Most Pitchers Get This Wrong)
More forward trunk flexion is NOT always better.
If it happens too early:
❌ Early trunk flexion leads to:
Loss of hip–shoulder separation
Reduced torque
Arm forced to generate velocity independently
Increased elbow stress (valgus load)
👉 This is where injuries like:
UCL strain
Capitellum compression starts to show up
🔑 TripleSpin Interpretation
The extra 20° of trunk flexion is beneficial only if it occurs AFTER:
Hip hinge is established
Pelvis rotates and stabilizes
Shoulder begins rotational acceleration
Then—and only then—the trunk flexion becomes:
👉 A velocity amplifier, not a compensation
Simple Coaching Translation
The difference comes down to connection vs. disconnection with the ground at the most critical instant of the delivery.
When the back foot acts as a rudder, it maintains a brief, purposeful relationship with the ground that continues to guide the delivery. When it lifts too early and is “in the air” at ball release, that connection is gone—and with it, a layer of control, sequencing, and force efficiency.
1. Ground Reaction Forces Don’t Just Disappear at Foot Strike
Velocity is built from the ground up. Even though the front leg becomes the primary stabilizer at foot strike, the back leg still contributes residual force and directional guidance.
Research from Glenn Fleisig and ASMI shows that:
Efficient pitchers maintain force transfer continuity
Energy flows through the system without abrupt breaks
👉 When the back foot stays connected (lightly, as a rudder):
The system stays “linked” to the ground longer
Force transfer remains smooth and continuous
👉 When the foot lifts early:
You create a break in the kinetic chain
The body must stabilize itself mid-air instead of through the ground
2. Directional Control Through Release
The back foot acting as a rudder helps control:
pelvic direction
trunk path
release point consistency
It prevents:
spinning off
flying open
drifting off-line
👉 With the foot in the air:
There is less ability to correct direction late
Small errors in sequencing become bigger misses at release
3. Center of Mass Stability
At ball release, the pitcher is in a highly dynamic position:
front leg bracing
trunk accelerating forward
arm moving at extreme speeds
The back foot, even with minimal pressure, provides:
a stability reference point
balance through rotation and flexion
👉 Remove it too early:
The body becomes less stable in space
More reliance is placed on the arm to “find” the release
4. Timing of TripleSpin Sequencing
Within the TripleSpin model:
Hip turn
Shoulder turn
Arm delivery
4. The back foot as a rudder helps:
complete the first spin (pelvis) cleanly
allow the second spin (torso) to accelerate properly
set up the third spin (arm) to fire on time
👉 If the back foot leaves early:
The pelvis can lose direction or stall
The torso may rotate early
The arm is forced to catch up
This is where you see:
late arm
excessive layback
increased stress
5. Energy Leak vs. Energy Continuity
Think of the delivery like a chain of energy transfer.
👉 Back foot as rudder:
Energy flows continuously
No abrupt “disconnect”
Efficient transfer into release
👉 Back foot in the air early:
Energy leaks out of the system
Momentum becomes less directed
The arm compensates
6. Deceleration and Injury Implications
The back foot staying connected slightly longer also helps:
control deceleration patterns
prevent violent, uncontrolled finishes
When it lifts early:
the body often spins or falls off to compensate
increases stress on:
elbow (valgus load)
shoulder (internal rotation stress)
⚠️ Important Clarification
This does NOT mean the back foot should stay planted or push hard late.
That would turn it into an anchor—which is just as problematic.
The ideal is:
👉 Light, guiding contact that releases naturally AFTER energy has transferred forward
🔑 Simple Coaching Translation
“Keep the back foot connected just long enough to guide the delivery—�not long enough to hold it back.”
The Big Picture
The back foot as a rudder gives you:
better direction
better sequencing
better stability
better energy transfer
better command
The foot in the air too early gives you:
disconnection
timing breakdowns
arm compensation
increased injury risk
https://podcast.apple.com/us/podcast/episode-2028-toe-the-rubber-hosted-by-jim-rooney-with/id1624830660?i=1000771206744
https://rooneybasball.com
