Place the device where the athlete can see it. Each round, a color word flashes — athlete reacts physically based on the INK COLOR. Coach confirms correct/wrong.

A math problem flashes on screen. The answer reveals briefly — athlete reacts physically to ODD or EVEN. No device interaction needed.

A colored arrow flashes on screen. Athlete reacts physically — move in the arrow's direction, or respond based on color, or both. Fully automatic.

A cone color flashes on screen. Athlete sprints to that cone. A rest interval follows before the next stimulus.

Athlete stands on the box, device on a tripod with the sound up. A beat plays and a grid of 8 rhyming pictures appears. The highlight moves one box per beat — athlete says each picture out loud on the beat. At a random moment the screen shows JUMP, then reveals R, L, or B — land right leg, left leg, or both. If fake-outs are on, watch for DON'T JUMP and hold still.

Athlete stands on the box, device on a tripod facing them. A new Stroop word appears every 2 seconds — athlete calls out the INK COLOR out loud (not the word) the whole time, honor system. When the window ends, the screen shows JUMP, then about half a second later reveals R, L, or B below it — land right leg, left leg, or both. If fake-outs are on, watch for DON'T JUMP and hold still.