Get a full page from a newspaper. Put one corner in the middle of your hand. Gather up the rest of the paper by pulling it in with your fingers.
Put your hand on the desk in front of you. Push down hard with each finger and thumb, one at a time for 3 seconds, and later 6 seconds. Look up isometric exercises.
UK
Put your hand on the desk in front of you. Push down hard with each finger and thumb, one at a time for 3 seconds, and later 6 seconds. Look up isometric exercises.
UK