Patent ID: 7207930
Filing Date: 2007-04-24
Classification: A63B

Abstract:
1. An exercise device comprising: a first bladder formed of a first material having a first elasticity such that the first bladder has a first stiffness corresponding to a first resistance to compression, a second bladder in fluid communication with the first bladder and formed of a second material having a second elasticity such that the second bladder has a second stiffness corresponding to a second resistance to compression whereby the second stiffness and corresponding second resistance to compression is greater than the first stiffness and corresponding first resistance to compression; and a fluid contained within the first and second bladders, wherein compression of the first bladder causes a portion of the fluid contained therein to be transferred to the second bladder, wherein the elasticity of the first material is at least about 1.5 times greater than the elasticity of the second material when no fluid is present in either bladder.