Exercise
«Thumb / OK»

Step-by-step instructions

1. Keep both hands fully inside the camera frame.
2. Show thumbs-up on the left and OK on the right.
3. Hold the shapes so the tracker can recognise them.
4. Swap together: OK on the left, thumbs-up on the right. Follow the app prompts.

What to pay attention to

The task is to maintain two different finger positions and switch them together. Practise each shape separately: keep the other fingers closed for a thumbs-up and connect the thumb and index finger for OK. Check both hands before swapping. A clear, deliberate switch is more useful for learning the rule than a rushed movement.

Common mistakes

• Showing the same sign on both hands.
• Leaving the OK ring open or the thumb bent.
• Switching one hand early or moving out of frame.

Make it easier

Practise each sign separately without a camera, then swap slowly with both hands. Say the next gesture aloud if it helps.

Once it feels familiar

Aim for simultaneous swaps without a pause between hands. Keep each shape clear; the app already changes its requirements across levels.

Who can try it

Anyone interested in trying a short two-hand coordination task. Children can learn with an adult, without speed or score targets. Start at a comfortable pace and stop if the movement is uncomfortable. This is a game, not a health test or treatment.