Erin Carson - ECFIT Strength

Erin Carson - ECFIT Strength Helping high-performance humans build and maintain strength for sport and life.

Founded by Erin Carson, ECFIT Strength is a sport-specific approach to strength training designed to support & complement high-volume endurance sessions as well as many other sports. With a focus on core elements of functional movement, the ECFIT Strength Coaches work with many of the world’s best triathletes, cyclists, and runners every day from home base in Boulder, Co. These athletes do the kin

d of work at home and in the gym that allows them to train harder, longer, and without injury, then show up at the starting line ready to compete at the highest level.

There’s a difference between building strength and moving well.You’ve seen it before in high-level athletes. The way the...
05/14/2026

There’s a difference between building strength and moving well.

You’ve seen it before in high-level athletes. The way they move looks effortless, almost like everything connects without force. That doesn’t come from strength alone. It comes from how well the body coordinates, how the hips and shoulders separate, and how smoothly everything works together. When someone comes in, I’m not just looking at output. I’m looking at how they move through simple patterns like running backwards or lateral steps. That usually tells you where things are flowing and where they’re not. From there, the work is about smoothing that out and finding the next layer.

Pay attention to how your movement feels, not just how strong you are. If you want more structure around this, you can try ECFIT free for 14 days.

You might be surprised…There isn’t a completely different approach for professional athletes.The principles are the same...
05/11/2026

You might be surprised…

There isn’t a completely different approach for professional athletes.

The principles are the same. The difference is in how they’re applied.

Every athlete comes in with a different structure, different history, and different genetic makeup. The goal is not to make everyone move the same, it’s to understand what’s in front of you and optimize it.

That’s true whether I’m working with someone in the pro world at the top 1% or someone just trying to get better within their own capacity. It always comes back to the same thing.

Work with what you have and develop it well.

Ever go for a run and everything feels heavy? Well, that’s usually a sign you’re relying on muscle.Elastic energy is wha...
05/09/2026

Ever go for a run and everything feels heavy? Well, that’s usually a sign you’re relying on muscle.

Elastic energy is what makes things feel lighter.

It’s your body’s ability to store energy when you land and get it back as you push off. Almost like a spring. When that’s working, you’re not creating force every step, you’re reusing it. When it’s not, everything takes more effort.

But this isn’t something you fix by trying to be more explosive.
It comes back to position. If the foot can’t load, the ankle is stiff, or the hips are stuck, you lose the ability to store and release energy. That’s when everything turns into muscle.

When those pieces start to move better, the bounce tends to show up on its own.

Pay attention to whether your movement feels springy or forced.

05/07/2026

If you’re not sleeping well, it might not be a sleep problem.

Your body needs an appropriate level of fatigue to actually rest and recover. Too little, and there’s no drive to sleep. Too much, and you stay wired and beat up.

Most people look for answers in new trends, when sometimes it comes back to how they’re training.

The right amount of work tends to solve more than people expect.

Sleep matters more than most people realize, especially when it comes to performance and recovery. If this is something you struggle with, I’d be interested to hear, below. Let me know, and we can talk more about it!

Injury prevention usually comes back to how you’re moving.Pause for a second. Look at your feet. Are they turned out? If...
05/06/2026

Injury prevention usually comes back to how you’re moving.

Pause for a second. Look at your feet. Are they turned out? If they are, there’s a good chance the outer hip is holding more tension, and you’re losing some of the internal rotation your body needs to move well.
That changes how force moves through your lower body. Your tibia should have a gentle internal rotation as you load, and your foot should be able to move, not stay locked.

Start by getting back to position. Big toes connected, heels slightly apart, knees drawing in. It won’t feel natural for everyone, especially if you spend a lot of time on the bike.

But that’s usually the point.

From there, create some space through the outer hip so strength actually has somewhere to go.

I’ve said this for a long time, but if you show me strength, I’ll give you length!

Curious what you notice when you check your feet? Tell me below what you saw!

My dad always gave me a piece of advice that has stayed with me my entire life and I want to share it with you.Surround ...
05/03/2026

My dad always gave me a piece of advice that has stayed with me my entire life and I want to share it with you.

Surround yourself with amazing people (see above for my most important one). People you admire. People you want to learn from. People who challenge you to be better.

That mindset has shaped so many parts of my life. The athletes I work with. The coaches and mentors I learn from. The community that continues to grow around ECFIT.

I’ve been incredibly lucky to be surrounded by people who inspire me every day.

Thanks, Dad, for that wisdom. It’s guided me more than you probably ever knew. I miss you every day!!

05/01/2026

Mobility is one of the simplest ways to change how your body feels for the rest of the week.

A few intentional minutes creating space in the hips, ankles, and thoracic spine can shift everything. Your stride feels smoother. Your posture holds longer. Your strength work feels cleaner.

The key is not doing everything. The key is doing something consistently.

Mobility Monday is your weekly reset. A chance to check in with your body, reconnect to good movement, and set the tone for the week ahead.

Join me every Monday morning at 6:45 AM MST on YouTube. Share this with a friend that will hold you accountable!

Did you know I have a golf strength program inside ECFIT? With training for the Women’s U.S. Open, I’ve definitely had g...
04/29/2026

Did you know I have a golf strength program inside ECFIT?

With training for the Women’s U.S. Open, I’ve definitely had golf on the brain a lot more than usual.

Golf may not always get talked about like other sports when it comes to strength training, but the same principles apply. Mobility, rotational strength, balance, and control all play a huge role in creating a powerful and repeatable swing.

That’s exactly why I built a program specifically for golfers. It focuses on helping your body move well so you can generate power, stay consistent, and keep playing the game you love.

If you play golf and want to support your game from the physical side, the program is available on the ECFIT site. Link in bio!

Consistency rarely looks impressive in the moment.Real progress is usually built through small efforts repeated over tim...
04/27/2026

Consistency rarely looks impressive in the moment.

Real progress is usually built through small efforts repeated over time. Showing up for the mobility work, lifting with intention, and taking recovery seriously all add up far more than one big workout ever will.
The athletes who improve the most are not the ones doing the most in a single session. They are the ones who stay consistent long enough for those small efforts to compound.

Stay patient with the process. Consistency is where the real progress lives.

If you are ready to build strength and mobility through consistent, purposeful work, come join me inside ECFIT and start your 14-day free trial.

04/25/2026

Most people spend more time sitting than they do training.

So how you sit matters!

I’ve been using the Core Chair for a while and it’s something I’ve stuck with because it allows for movement instead of fixing you into one position.

It’s a small change, but it adds up. Less stiffness, better awareness, and a better starting point when you actually go to train.

If you're interested in trying one for yourself, send me a DM and I can share a promo code!

04/23/2026

Most endurance sports happen on one leg at a time.

That’s why single-leg RDLs matter. This movement builds balance, posterior chain strength, and the kind of stability that keeps your form together when fatigue sets in. Move with control, keep the hips square, stay long through the spine, and let the back leg reach behind you.

Save this one for your next strength session and give it a try.

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