Use a stable chair and keep heels supported. This recreational activity is not medical assessment or treatment; stop for discomfort.
How to play
Sit in a stable chair with both heels supported. Choose both ankles, left only or right only. Camera mode calibrates your own comfortable toes-up and toes-down range, then you follow each direction cue to help the fish collect bubbles. Without a camera, use the large buttons, Up/Down arrows or W/S.
Comfort and safety
Start at 1/8×, 1/4× or 1/2×. Speed changes actual cue generation and animation timing. Do not force the ankle or lift the heel. Stop for pain, cramping, dizziness, breathlessness or unusual fatigue. Camera pose data stays in the browser and raw video is not saved.
This general recreational activity is not a medical measurement, circulation test, assessment, diagnosis or treatment.