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Why does my runner look like they're sitting down when they run?

A hip that never fully opens leaves the foot landing out in front of the body on every single step, which reads on film as a braking force, not just an odd-looking posture.

Some runners look like they are moving forward while seated in a chair: hips tucked under, trunk upright or even leaning slightly back, knees out in front rather than driving down and back beneath the body. Coaches usually spot it before they can name it, which is why it tends to get described by the picture rather than the fault.

Why it happens

Most often it comes from the hip never finishing its extension, whether that is weak glutes and hamstrings that cannot drive the leg all the way through, or a habit built from being told to "run tall" and overcorrecting into leaning back rather than standing upright. Either way, the leg lands reaching for ground that is still out in front of the hips, instead of already moving backward under the body at touchdown.

What it actually costs

• Longer ground contact time, because the leg lands reaching rather than already in motion under the hips.
• A braking force at every single landing instead of a forward push off it.
• A shorter, choppier stride even when the athlete is visibly straining to lengthen it.

What the Film Room reports

The sprint setting reports trunk lean against a 0 to 20 degree range and overstride, how far the foot lands ahead of the hips, from a side-on clip. An athlete sitting into their stride typically shows a trunk lean reading near zero, sometimes slightly negative, paired with a larger overstride number than their effort level should produce. Neither number alone proves this specific fault, but the two together, a flat or backward trunk angle next to a big overstride, usually point at it more clearly than watching live does.

A single 2D camera can measure the lean angle and where the foot lands. It cannot tell you whether the real cause is weak glutes, a tight hip flexor limiting how far the leg can extend, or just a cue that was never actually demonstrated. Sorting out which one it is still takes a coach's hands and eyes, not another clip.

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