sit with forearm supported, hand off armrest, palm down, repeatedly open and close fingers into a fist.
Sit on the chair, rest the forearm on arm rest such that hand is off the arm rest and palm facing towards the floor. Keep the fingers and palm open, make the fist by closing all the fingers, open the fingers to starting position and repeat.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.
