Joint angles from ordinary video

1. Open a clip and trim it to the movement.
2. Keendra finds your athlete and draws a skeleton over them. This usually takes about as long as the clip itself.
3. Keendra calculates the angles by itself. Pick the ones you want to follow and play the clip.

• Arms, left or right: elbow angle, shoulder elevation and shoulder abduction.
• Legs, left or right: knee angle, hip flexion and hip abduction.
• Body: shoulder–hip separation, shoulder–hip tilt, pelvis rotation, pelvis tilt, shoulder rotation, shoulder tilt, trunk lean forward and trunk lean sideways.

Each angle shows its value, a short graph of the last few seconds and a small figure of the joint. Follow two angles at once, or put both sides in one box, like both knees, to compare left against right.

Angles appear on a second display, in snapshots and in voice-over videos, so your athlete sees the same number you do.

Pause on any frame and use the Angle tool to draw one yourself, with its degrees.

Keendra estimates angles from a 3D model of the athlete, so they're approximate. Watch how an angle changes through the movement rather than reading it to the exact degree. Keendra isn't a medical device.

You get the best result when you film from the side and your athlete is large in the picture, well lit and not hidden behind others. Keendra follows one athlete per clip and analyzes up to two minutes of each clip.