Abstract: 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(s). More particularly, it relates to a device which applies a reactive force against the hand(s) and one or more of the fingers of a user when the device is held firmly in one or both of a user's hands. The user specifies the hand(s) and finger(s) 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 (e.g., the grip of a hand tool) or while playing a sport (e.g., the grip of a golf club or baseball bat). The invention also relates to a method of exercising or rehabilitating fingers, individually or as a group, to strengthen the hand(s) and desired finger(s) thereof.