Practice has one camera problem: the person best qualified to watch the athlete is the one stuck filming them.
Every setup here starts the same way: tripod the phone at the runway, the lane, the mat, the approach. Draw a trigger zone on the screen. From that moment the station runs itself: it records each crossing, ignores the walk-backs, and puts a replay on screen before the athlete has caught their breath. Nothing uploads. Nobody logs in. It just watches the gate.