Squeeze excerisers are used in hand and arm rehab and in grib improvement workout programs. Wrist, finger and thumb flexors are the most common muscles targeted. Squeeze excerisers are also a great way to help relieve stress while watching television, riding in a car, or at work while on the computer. Squeezing the ball causes muscle tension followed by muscle relaxation after release. This excerise performed repeatedly releases considerable muscle tension and helps to relieve stress. A common stress relief exercise is to squeeze the exerciser at about 30 percent of maximum pressure about 10 to 20 times in a row, and then rest for a few minutes before repeating each set.