07/08/2025
🦴 𝐓𝐡𝐢𝐜𝐤 𝐋𝐞𝐠𝐬, 𝐓𝐡𝐢𝐧 𝐋𝐢𝐞𝐬: 𝐖𝐡𝐲 𝐁𝐨𝐧𝐞-𝐓𝐞𝐧𝐝𝐨𝐧 𝐂𝐢𝐫𝐜𝐮𝐦𝐟𝐞𝐫𝐞𝐧𝐜𝐞 𝐀𝐥𝐨𝐧𝐞 𝐈𝐬 𝐚 𝐅𝐚𝐥𝐬𝐞 𝐏𝐫𝐨𝐩𝐡𝐞𝐭
(And why your horse needs sprints more than he needs a supplement bucket.)
“He’s got good bone.”
Translation: “His legs look like fence posts.”
Reality? That doesn’t mean jack sh*t for long-term durability.
Let’s clear the arena dust and shoot straight:
Bone-tendon circumference (BTC) tells you the size of the cannon—not its density, strength, or soundness. If you’re not applying progressive, varied, mechanical strain, you’ve got a cosmetic cannon... not a durable one.
📏 𝐖𝐡𝐚𝐭 𝐁𝐨𝐧𝐞-𝐓𝐞𝐧𝐝𝐨𝐧 𝐂𝐢𝐫𝐜𝐮𝐦𝐟𝐞𝐫𝐞𝐧𝐜𝐞 𝐀𝐜𝐭𝐮𝐚𝐥𝐥𝐲 𝐓𝐞𝐥𝐥𝐬 𝐘𝐨𝐮:
✅ 𝐁𝐓𝐂 𝐂𝐚𝐧 𝐈𝐧𝐝𝐢𝐜𝐚𝐭𝐞:
• A large cannon bone
• Developed tendons/ligaments
• Visual symmetry
❌ 𝐁𝐓𝐂 𝐃𝐨𝐞𝐬 𝐍𝐨𝐭 𝐏𝐫𝐨𝐯𝐞:
• Bone mineral density (BMD)
• Cortical thickness
• Remodeling or load history
• How it handles mechanical stress
🧠 𝐀𝐧𝐚𝐥𝐨𝐠𝐲 𝐭𝐢𝐦𝐞:
BTC is like judging a pipe by its diameter—without knowing if it’s made of steel or PVC.
📚 “𝐁𝐨𝐧𝐞 𝐜𝐢𝐫𝐜𝐮𝐦𝐟𝐞𝐫𝐞𝐧𝐜𝐞 𝐚𝐥𝐨𝐧𝐞 𝐢𝐬 𝐧𝐨𝐭 𝐩𝐫𝐞𝐝𝐢𝐜𝐭𝐢𝐯𝐞 𝐨𝐟 𝐬𝐭𝐫𝐞𝐧𝐠𝐭𝐡 𝐮𝐧𝐥𝐞𝐬𝐬 𝐩𝐚𝐢𝐫𝐞𝐝 𝐰𝐢𝐭𝐡 𝐦𝐢𝐧𝐞𝐫𝐚𝐥 𝐝𝐞𝐧𝐬𝐢𝐭𝐲 𝐚𝐧𝐝 𝐦𝐞𝐜𝐡𝐚𝐧𝐢𝐜𝐚𝐥 𝐥𝐨𝐚𝐝𝐢𝐧𝐠 𝐡𝐢𝐬𝐭𝐨𝐫𝐲.” —𝐆𝐫𝐞𝐯𝐞 𝐞𝐭 𝐚𝐥., 𝟐𝟎𝟏𝟒
📚 “Bone thickens into the 5th year, but real strength only comes with stress-induced remodeling.” —Bennett, n.d.; Lawrence, 2005
🚫 𝐀𝐫𝐞𝐧𝐚 𝐖𝐨𝐫𝐤 ≠ 𝐁𝐨𝐧𝐞 𝐑𝐞𝐦𝐨𝐝𝐞𝐥𝐢𝐧𝐠
Jogging and loping in soft, fluffy arena footing 6 days a week?
That’s cardio. Not cortical bone development.
And when you ride for 20–60 minutes then stick them back in a box stall for the next 23 hours?
You're actually undoing progress.
Even in mature horses, bone is use-it-or-lose-it.
Stall rest for just 10–14 days leads to measurable bone loss—starting in the spongy trabecular bone near joints, eventually impacting the denser cortical layers (Firth, 2006; Logan & Nielsen, 2021).
🧬 𝐖𝐚𝐥𝐤𝐢𝐧𝐠 𝐝𝐨𝐞𝐬𝐧’𝐭 𝐦𝐞𝐞𝐭 𝐭𝐡𝐞 𝐬𝐭𝐫𝐚𝐢𝐧 𝐭𝐡𝐫𝐞𝐬𝐡𝐨𝐥𝐝 (~𝟏𝟎𝟎𝟎 𝐦𝐢𝐜𝐫𝐨𝐬𝐭𝐫𝐚𝐢𝐧) 𝐟𝐨𝐫 𝐫𝐞𝐦𝐨𝐝𝐞𝐥𝐢𝐧𝐠.
That takes trotting, cantering, sprinting—on firm ground.
Dr. Deb Bennett puts it plainly:
“Bone grows wide through age 5, but if there’s no stress, there’s no structure.”
And Firth agrees:
“Real remodeling only happens with high-impact, cyclic loading—not cushy, repetitive movement.”
💥 𝐖𝐚𝐧𝐭 𝐃𝐮𝐫𝐚𝐛𝐥𝐞 𝐁𝐨𝐧𝐞? 𝐃𝐨 𝐓𝐡𝐢𝐬 𝐈𝐧𝐬𝐭𝐞𝐚𝐝:
✅ Sprint, long-trot, gallop, lope, and jog—in long, straight lines
✅ Work over firm terrain (dirt, pasture, small gravel—not deep sand)
✅ Add resistance (pony off a Gator, pull a tire)
✅ Use intervals: work + rest = adaptation
✅ Start early, progress slowly
✅ Give it time—bone takes ~120 days to remodel
💪 𝐓𝐡𝐞 𝐄𝐪𝐮𝐢𝐧𝐞 𝐏𝟗𝟎𝐗 𝐏𝐫𝐨𝐠𝐫𝐚𝐦
My Real-World 12-Week Conditioning Plan
Not for racetrack prep. For stock horses headed to the show pen—halter, pleasure, ranch, cow horse.
📅 𝐒𝐚𝐦𝐩𝐥𝐞 𝐖𝐞𝐞𝐤𝐬: (𝐓𝐡𝐢𝐬 𝐢𝐬 𝐧𝐨𝐭 𝐭𝐡𝐞 𝐟𝐮𝐥𝐥 𝐫𝐨𝐮𝐭𝐢𝐧𝐞 𝐨𝐫 𝐢𝐧 𝐠𝐫𝐞𝐚𝐭 𝐝𝐞𝐭𝐚𝐢𝐥 𝐛𝐞𝐥𝐨𝐰).
• Week 1: 3 min trot + 2 min gallop + 1 min jog
• Week 6: 6 min trot + 4 min gallop + 2 min lope
• Week 12: 10 min lope + 4 min gallop + 4 min jog
• 🔁 Rotate footing: grass → manure track → shallow sand → hard-packed dirt
• ❌ No longeing. No circles. No deep footing.
• ✅ Straight lines. Load. Recovery. Results.
“Lunging in deep sand doesn’t build bone—it builds vet bills.”
📚 Raub et al. (1989) showed yearlings trotted on firm footing had 25% higher bone mineral content than stalled horses.
Terrain and speed matter.
And so does experience:
6 World titles. 4 National titles. ROMs. Superiors.
I’ve lived the trial and error. I’ve experienced what works—and what absolutely does not.
🚫 𝐓𝐡𝐨𝐬𝐞 𝐅𝐢𝐭𝐭𝐢𝐧𝐠 𝐏𝐫𝐨𝐠𝐫𝐚𝐦𝐬?
Sending your yearlings to hot walkers and exercisers for circles, circles, and more circles?
They're not getting fit.
They're getting fat.
They might look full and glossy, but they haven’t built bone or cardiovascular fitness.
You just paid top dollar for a pretty package of bullsh*t.
You know what horses do in a pasture? They don’t jog in circles.
They run in straight lines. They jump logs. They load the limb.
👉 Fewer circles = fewer injuries.
👉 Fewer injections = more soundness.
👉 More sprinting = more bone.
A better plan? Find someone who really knows how to fit one, hire a photographer for photos, then take them to the sale.
💉 𝐑𝐞𝐩𝐞𝐚𝐭𝐞𝐝 𝐉𝐨𝐢𝐧𝐭 𝐈𝐧𝐣𝐞𝐜𝐭𝐢𝐨𝐧𝐬 = 𝐀𝐜𝐜𝐞𝐥𝐞𝐫𝐚𝐭𝐞𝐝 𝐁𝐫𝐞𝐚𝐤𝐝𝐨𝐰𝐧
In performance barns, it's standard:
“Inject the hocks.”
“Stifle’s due.”
“Keep him going until Finals.”
𝐋𝐞𝐭’𝐬 𝐛𝐞 𝐜𝐥𝐞𝐚𝐫:
Corticosteroid injections don’t make horses sound.
They make them 𝙛𝙚𝙚𝙡 𝙨𝙤𝙪𝙣𝙙—while structural damage keeps happening underneath.
🔬 𝐖𝐡𝐚𝐭 𝐓𝐡𝐞𝐲 𝐑𝐞𝐚𝐥𝐥𝐲 𝐃𝐨:
• Reduce cartilage quality
• Thin articular surfaces
• Increase friction and joint wear
• Suppress pain while damage builds
(Massey et al., 2011; Firth, 2006)
🧱 𝐒𝐮𝐛𝐜𝐡𝐨𝐧𝐝𝐫𝐚𝐥 𝐁𝐨𝐧𝐞 𝐒𝐮𝐟𝐟𝐞𝐫𝐬 𝐓𝐨𝐨:
• Becomes less mineralized
• Grows more brittle
• Higher risk of cysts, sclerosis, and collapse
Some vets now call it Injection Breakdown Syndrome—and it’s rampant in reiners and cutters injected into the ground to meet show deadlines.
𝐍𝐨𝐰 𝐚𝐝𝐝 𝐭𝐡𝐢𝐬 𝐭𝐨 𝐭𝐡𝐞 𝐞𝐪𝐮𝐚𝐭𝐢𝐨𝐧:
These same horses—already managing microdamage—are spending 23 hours a day standing in a stall, 6–7 days a week, with little to no turnout or free movement.
𝐓𝐡𝐚𝐭 𝐦𝐞𝐚𝐧𝐬:
• No opportunity for natural loading
• No chance for bone or cartilage to remodel
• And zero stimulation of synovial fluid production or joint hydration
🧨 Combine repetitive high-impact maneuvers, masked pain, weakened joints, and 24/7 confinement—and you’ve got a perfect recipe for career-ending lameness or retiring early to the breeding shed. This isn’t just true in horses, it happens in humans too. Repeated joint injections break down the bone, put more stress on tendons, ligaments, and soft tissues. Ask me about the full rotator cuff repair I have to have now due to repeated shoulder injections to manage arthritis.
✅ 𝐓𝐡𝐞 𝐒𝐦𝐚𝐫𝐭𝐞𝐫 𝐏𝐥𝐚𝐲:
• Inject only when necessary—not on autopilot
• Pasture (not stall) rest IS a thing that works wonders. Your ass is the one that has to have the patience to do it.
• Condition the horse before problems show up
• Use terrain, interval work, and progressive stress
• Focus on tendon and bone remodeling—not masking pain
🥩 𝐅𝐞𝐞𝐝 𝐌𝐚𝐭𝐭𝐞𝐫𝐬—𝐁𝐮𝐭 𝐒𝐭𝐫𝐚𝐢𝐧 𝐁𝐮𝐢𝐥𝐝𝐬 𝐁𝐨𝐧𝐞
• Ca:P = 2:1
• Balanced trace minerals
• Avoid high sugar feeds
• Post-workout protein + B12
• Forage first, always
“You can’t fix bad fitting with a mineral tub.”
⚖️ 𝐂𝐢𝐫𝐜𝐮𝐦𝐟𝐞𝐫𝐞𝐧𝐜𝐞 𝐯𝐬. 𝐒𝐭𝐫𝐞𝐧𝐠𝐭𝐡
𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐃𝐢𝐝 𝐯𝐬 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐆𝐨𝐭
Bred for more BTC Prettier legs
Jogged in soft arena Weak, unremodeled bone
Sprinted on firm terrain Load-bearing, mineralized structure
Waited to break until 4+ Fused spine, mature joints
You can breed it.
You can feed it.
You can wrap it in neoprene and bathe it in IceTight.
𝐁𝐮𝐭 𝐢𝐟 𝐲𝐨𝐮’𝐫𝐞 𝐧𝐨𝐭 𝐥𝐨𝐚𝐝𝐢𝐧𝐠 𝐢𝐭, 𝐲𝐨𝐮’𝐫𝐞 𝐧𝐨𝐭 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐢𝐭.
Durable horses aren’t made in the barn aisle and fancy stalls. They’re built in motion.
With time. With terrain. With tensile stress. With science.
📚 References:
• Bennett, D. (n.d.). The Ranger Piece. Equine Studies Institute.
• Firth, E. C. (2006). Journal of Anatomy, 208(4), 513–526.
• Greve, L. et al. (2014). Equine Veterinary Journal, 46(4), 554–559.
• Lawrence, L. M. (2005). Kentucky Equine Research Conference Proceedings.
• Massey, P. D. et al. (2011). AAEP Proceedings.
• Raub, R. H. et al. (1989). Journal of Animal Science, 67(2), 506–514.
