Form follows function
The anatomy of running progress (Part II)
“My form sucks.”
I hear this from time to time when working with runners, triathletes, and even recreational fitness enthusiasts.
My first response is usually a question.
How do you know?
What are you comparing yourself to? A professional runner? Someone on Instagram? A slow-motion video of your last interval?
More importantly, how do you know that changing your form would actually improve your performance?
Human movement is remarkably variable. There is no single “perfect” running stride, and many highly successful runners move in ways that look very different from one another. There is room for individual differences.
Instead of obsessing over how your stride looks, it may be more productive to think about the qualities that allow you to express good mechanics in the first place.
Strength
Stamina
Speed
These are the foundations. When they improve, your body often begins to organize itself more efficiently without forcing every movement into an idealized template.
Several months ago, I published the article below where I discussed how different body systems adapt on different timelines.
Leveling up
The human body is a coordinated interaction of multiple systems, all adapting on different schedules. This is why lifting weights a few times per week can produce noticeable strength gains, while running or cycling only once or twice per week rarely moves the needle much. Some systems need more frequent stimulation than others.
Looking back, that idea was really the beginning of this series. When you appreciate those timelines, you begin to understand the anatomy of making progress—not just in running, but in endurance sport as a whole.
Before we can talk about maintaining good mechanics, though, we have to build the systems that make those mechanics possible.
That is where this week’s discussion begins.
Poor form often is not showing up in the first mile. It is fatigue that slowly erodes the qualities supporting that form.
The shoulders tighten. Ground contact lengthens. Cadence drifts. Posture collapses. The stride that felt effortless at mile two becomes expensive at mile twelve. In many cases, your form is probably better than you think but your ability to maintain it when fatigue arrives is the real limiting factor.
There are certainly things that could be nitpicked about my running form in this photo above. This was taken just a few strides from the finish line of a 5K race five years ago. I set a personal best that day.
Could slightly better form have been the difference between my previous PR and that performance? Could it have contributed to the many personal records I’ve run since?
Maybe.
I’m skeptical that it was the primary reason.
Instead, I think the bigger contributor was the work I put into improving the machinery that drives performance in the first place. Stronger muscles. A larger aerobic engine. Better fatigue resistance. More speed.
As those qualities improved, so did my running economy. And as my running economy improved, I was able to sustain a higher average velocity over the race distance.
Rather than viewing running form as something to be endlessly corrected, I think it is often more useful to view it as an expression of function. Build a stronger, more capable athlete, and better movement frequently follows.
Strength
With each foot strike, your body has a fraction of a second to accept load, store elastic energy, and propel you forward again. The stronger and stiffer the system is, the less “effort” that process requires relative to your maximum capacity.
This is why strength training has repeatedly been shown to improve running economy, even when VO₂max remains unchanged1.
Strength also gives you options.
It allows you to maintain posture late in a race. It helps resist excessive hip drop. It improves force transfer through the trunk and lower extremity. It reduces the amount of movement that is simply wasted.
Notice what we are doing here.
We are building a body that is capable of moving better. And, for what it is worth, a body that moves better may also be at less risk for injury which is where some of the value for strength training with respect to injury reduction may lie.
Stamina
Fatigue changes what your body is capable of producing and the movement pattern defined as your “form” becomes more expensive when fatigue sets in.
When most people hear the word stamina, they immediately think of the heart and lungs. Those certainly matter, but stamina extends well beyond your aerobic engine. Your muscles, tendons, connective tissue, and nervous system all need the capacity to repeat thousands of nearly identical contractions without a meaningful drop in performance. This goes for any endurance sport.
The athlete who preserves their mechanics the longest is often the one who finishes the strongest. This is one reason long days, threshold days, speed days and consistent weekly volume are so valuable. It is a package deal and they all interact to teach the body to continue producing efficient movement long after fatigue begins to accumulate.
Speed
At first glance, speed may seem like the least important quality for an endurance athlete, but speed changes the equation and is also relative to the distance being covered.
Imagine two runners racing a 5K at the exact same pace. One has spent years developing top-end speed through strides, hill sprints, intervals, and general athletic development. The other has done almost exclusively easy mileage.
Although they are moving at the same velocity, the race represents a smaller percentage of the first runner’s maximum capability.
When your ceiling is higher, race pace becomes more comfortable. You spend less time recruiting your highest-threshold motor units, you produce force more economically, and you delay the fatigue that slowly erodes movement quality.
This is one reason speed work benefits athletes well beyond the duration of the intervals themselves. It both helps teach you to go faster and it expands your performance reserve.
A larger reserve allows you to move with greater confidence, better coordination, and less relative effort across a wide range of paces. See the article below to understand that a bit more:
Strength → Can you produce enough force?
Stamina → Can you keep producing it under fatigue?
Speed → Can you make race pace a smaller fraction of your overall capacity?
When you look at endurance performance through this lens, form begins to make a little more sense.
Ask: "What qualities am I missing that prevent me from holding good mechanics?"
In many cases, improved form in endurance sports is simply what efficient movement looks like when strength, stamina, and speed have all been developed together.