Scan the CMJ — side view
Side view at hip height, feet and head in frame the whole time. Use slow motion — 120 or 240 fps if the phone has it.
How to film it
Side view at hip height, feet and head in frame the whole time. Use slow motion — 120 or 240 fps if the phone has it.
Video shows how the athlete organized the jump. Force plates show what forces they produced. We report jump height and takeoff velocity as performance output, and we do not estimate braking impulse, propulsive impulse, or bilateral force asymmetry.
Fix it with
What we measure in this block
Countermovement Depth
Video-derived mechanics
79
+22Above where most athletes this age sit. Find the shallowest dip that still jumps high.
Countermovement Time
Video-derived mechanics
65
+5Inconsistent rep to rep. Down fast, up faster.
Eccentric to Concentric Transition
Video-derived mechanics
71
+18Inconsistent rep to rep. No pause at the bottom — bounce out of it.
Hip / Knee / Ankle Sequencing
Video-derived mechanics
75
+11Above where most athletes this age sit. Hips first, then knees, then finish through the toes.
Trunk Strategy
Video-derived mechanics
76
+7Above where most athletes this age sit. Keep the chest quiet and let the legs do the work.
Arm Strategy
Video-derived mechanics
76
+11Above where most athletes this age sit. Arms back on the dip, up hard as the hips extend.
Takeoff Position
Video-derived mechanics
65
+5Inconsistent rep to rep. Finish tall — full extension before the feet leave.
COM Displacement
Performance output
66
+2Inconsistent rep to rep. Same setup on every attempt so the number means something.
Takeoff Velocity / Jump Height
Performance output
80
+20Above where most athletes this age sit. Three attempts, best one counts.
Left / Right Organization
Left / right symmetry
78
+19Above where most athletes this age sit. Single-leg work on the weaker side, then re-test.