Range of motion

Eight are measured by the pose engine itself: both shoulders, elbows, hips and knees. Six more have no engine feature and are calculated from the tracked landmarks — both wrists, both ankles, the neck, and the trunk's lean off vertical.

Every figure on screen and in every download says which of the two it is, joint by joint. A calculated angle and a measured one are not the same claim, and a report that blurs them is a report you cannot check.

Angles are reported in degrees, clockwise, on a 0–360 scale, where 180° is a straight limb. Each joint gets a bar spanning a full turn, so the length of one joint's band means the same as another's and the eye can compare them down a column, with a marker showing where the clip is right now.

A joint that works across the 0°/360° seam is reported with its minimum greater than its maximum — 322° to 124°, say — which is this app's notation for a range that wraps, not a mistake. The range itself is always the true span.

Mark a start and an end on the clip and every figure below it describes that section instead of the whole video — the summaries, the charts, the comparisons and the downloads all follow. Save the marked section as a named clip and it becomes a bookmark you can play, compare and export on its own.

Worth being plain about: the pose model has no spine landmarks between the shoulders and the hips, so lumbar curvature is not measurable from this footage and we do not claim to measure it. What is measurable is the inclination of the trunk as a whole, taken at the midpoint of the hips, where 180° is upright. That is what the low back figure reports, and the definition ships inside the JSON so nobody downstream mistakes it for the other thing.