Abstract: An apparatus for exercising a hand of a user allowing a full range of motion of the hand during use. The hand exerciser includes a dorsal wrap releasably secured about a wrist of the user and extending over a back side of the hand. A finger power band releasably engages the dorsal wrap and extends over at least one finger of the hand of the user providing a resistance to movement of the at least one finger. A thumb power band is also releasably engaged with the dorsal wrap and extends along a surface of a thumb of the hand of the user providing a resistance to movement of the thumb. The finger and thumb power bands move independently of each other allowing exercise of any of the entire hand, any individual finger or thumb and any combination thereof. Furthermore, the resistance provided by the finger and thumb power bands is adjustable based upon the strength of the user. Finger and thumb power bands having variable resistance levels may be interchangeably connected to the dorsal wrap as desired.