Patent ID: 7611447

Claim:
A leg exercise device having: a rigid base; two first separately sealed variable volume chambers mounted on or partially defined by the base; two second separately sealed variable volume chambers mounted on or partially defined by the base; a volume of fluid less than the combined maximum volume of the first and second chambers being located in each pair of first and second chambers; two first surfaces, each sized and located to receive a respective first part of each of a user's feet and convey compressive force between the first part and a respective first chamber, and two second surfaces, each sized and located to receive a respective second part of each of a user's feet and convey compressive force between the second part and a respective second chamber, and a valve; at least one passageway interconnecting each of said chambers with said valve; said valve having first and second states, wherein: when in the first state the valve isolates first chambers from second chambers and links, via respective passageways, the first chamber provided for one foot with the first chamber provided for the other foot and links, via respective passageways, the second chamber provided for one foot with the second chamber provided for the other foot, and when in the second state the valve isolates chambers of one foot from the chambers of the other foot and links, via respective passageways, the first chamber provided for one foot with the second chamber provided for the one foot and, via respective passageways, links the first chamber provided for other foot with the second chamber provided for the other foot.