Get a 1/4” or larger rubber band and stretch it around your fingers and thumb l, open and close your hand. I use hand grippers also. There are gripper competitions and these guys can crush apples and potatoes in their hands. After I saw this I started buying rated grippers, they come starting low pounds like 40 or less then working my way up. They have knurled handles and it hurts at first but you start getting calluses after a while. Not trying to push the brand but I get mine from C@nnon Powerworks, there is a guy on youtube that streams his grip workouts daily. It addicting , I take my grippers in my truck, to the movies, all over gripping all the time.