A form check is a description of how you moved in one clip, measured against the ranges most runners sit in. It is something to look at with your coach, never a diagnosis and never a training prescription on its own.
What Is Measured
Shin angle at foot contact - Where the foot lands relative to the knee. A foot that lands well ahead tends to brake each step.
Knee bend at foot contact - How much the knee is flexed as the foot lands.
Forward lean of the torso - Measured against the ground, not the frame, so a tilted camera does not skew it.
Knee bend while the foot is planted - How the leg loads through mid-stance (shown, never flagged).
Step rate - Steps per minute for the clip as a whole.
Each measurement shows your typical value, your spread across the contacts, the reference range, and the flag line. A flag line sits deliberately outside the reference range, so sitting a little outside the range is common and is not flagged.
The Page
Your video with the skeleton overlay - Press play, or click a marker on the timeline to pause on that contact with the angle drawn on the frame.
Working well - The measurements that sit where they should, in your own numbers.
Flagged moments - One row per pattern, with a chip for each contact it showed on. Click a chip to see that moment, with what good looks like drawn beside your angle.
The written summary - What the clip shows, the one thing that would change the picture most, and what to look at next.
What to work on - For every flagged pattern: a cue to think about while running, drills with doses, how to fold them into your plan, and when to film again.
Asking Your Coach
Press Talk it through with your coach on the result, or just ask. The coach reads the full measurements and knows the drills. Try:
"Walk me through my form check."
"What should I work on first?"
"Put the drills into my plan."
About the Numbers
Angles are measured from the video in the plane of the camera and are approximate to a few degrees. The result describes one clip; running form varies with pace, fatigue and terrain, so a second clip on another day tells you whether a pattern holds. Nothing here names a condition or replaces a professional looking at you in person; if something hurts, that is the person to see.
