Abstract: An exercise device providing a sling of flexible material forming a cradle supported by a frame so that the cradle is initially taut. The frame is basically a "U" shape fabricated from tube stock. The cradle may be fabricated of canvas with two opposing edges formed as channels into which the frame is inserted. A cross piece completes the closure of the "U" open end, holds the cradle taut and prevents the collapse of the cradle and frame when at upon by the user. The frame by be bent to form a support to hold the cradle in a fixed inclination to the horizontal. A riser and base by be attached to a frame to form a triangle to allow the cradle to be set at a plurality of preselected inclinations.