A combination treadmill/twister exercise device comprises a treadmill having a base frame and a pair of spaced shafts with an endless belt rotatably mounted over the shafts. The twister unit comprises a support frame having a rotatable platform mounted to the support frame. The twister unit is selectively in an operative location and in a storage location. The support frame is mounted to the base frame to dispose the rotatable platform above the endless belt when the twister unit is in the operative location.