Abstract: A water pressure driven massage apparatus for massaging portions of the human body includes a housing adapted to be placed in an ordinary shower enclosure while a user is in the shower. A water pressure operated power device is rotatably mounted in the housing, and a shower water diverter valve selectively delivers water under pressure to a nozzle that directs a jet of water to impinge upon and rotatively drive the water pressure operated power device. The power device is connected to a gear reduction drive train that converts the rotary motion of the water pressure operated power device to reciprocal motion A rod extends through the housing of the massage apparatus, and the rod is reciprocally driven by the gear reduction drive train. The outer end of the reciprocating rod is adapted to be attached to, or configured into the shape of, a variety of massaging devices.