Sprint block start
SetFirst Drive
Front knee
85–100° · Bezodis 2015Rear knee
115–135° · Slawinski 2010Trunk lean
drive corridorHip extension
drive corridorCase 001
Five movements
Different reps. Different exhibits.
Each sport has its own phases, its own checks, and its own peer-reviewed corridors. PRFCT Form chooses what to ask, and when to ask it.
Admitted
Admitted
Pending
Objected
Football tackle
ApproachContactDrive & Wrap
Body level
contact corridor · Hendricks 2015Head position
contact corridor · Tierney 2018Drive direction
drive corridorCase 002
Basketball jump shot
Set / LoadRelease
Base alignment
shoulder-width norm.Elbow stack
release corridor · Okubo 2006Wrist follow-through
release corridorCase 003
Push-up
TopBottom
Elbow angle
rep-depth corridorHip line
trunk-neutral corridorCase 004
Dumbbell curl
ExtendedContracted
Elbow travel
stability corridorTrunk sway
trunk-neutral corridorCase 005
+
Your own movement
Define the joints you care about and the range each one should sit in. The same phase logic and verdicts apply.
One angle is enough.
Film side-on where you can. No markers, no calibration frame, no second camera — the phases and corridors do the rest.
side-on capture of a rep in progress
Put the next rep into evidence.
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