Patent Document ID: 20130288866
Application ID: 13872264
Patent Flag: 0

Claim One:
1. An exercise device sized for a single appendage of human support, comprising: a compressible base, the base having a horizontally-extending central flat for maintaining a balanced, upright position of the exercise device, the base having one or more sides encircling the central flat which slope outward and upward around the central flat with a slope which increases as distance from the central flat increases, the sides permitting simultaneous pitch and roll instability to the exercise device at a beginning slope immediately adjacent the central flat of less than 45°; and a relatively rigid platform joined to and horizontally covering the compressible base at a height no greater than 10 inches over a bottom surface of the flat, the platform having a shape which provides substantially equal pitch and roll instability, the platform having a size for a single appendage of human support and at least 3 inches wider than the central flat.