this invention relates generally to an exercise and strengthening device for fingers and hands and a method of exercising and strengthening same , along with certain muscles of the arm . more particularly , it relates to a device which applies a reactive force against the hand and one or more of the fingers of a user when the device is held firmly in one or both of a user &# 39 ; s hands . the user specifies the hand and finger upon which the device applies such force by either selecting an appropriately configured device or fixing a changeable device in a desired configuration . the device is preferably configured to resemble the grips of an instrumentality the user would hold while working or while playing a sport . the invention also relates to a method of exercising or rehabilitating fingers , individually or as a group , to strengthen the hand and desired finger thereof .