Patent ID: 8434824

Claim:
A physical activity system for people having a need to expend energy while remaining generally immobile comprising: a support structure having four spaced apart legs; a first elastic cord having first and second ends, the first end of the first cord being connected to a first leg of the support structure and the second end of the first elastic cord being connected to a second leg of the support structure; a first sleeve disposed around and supported by the first elastic cord; a second elastic cord having first and second ends, the first end of the second elastic cord being connected to a third leg of the support structure and the second end of the second elastic cord being connected to a fourth leg of the support structure; a second sleeve disposed around and supported by the second elastic cord; and a footpad sleeve disposed around the first and second sleeves and supported by the first and second elastic cords, the first elastic cord, the second elastic cord, the first sleeve, the second sleeve and the footpad sleeve depending from the first, second, third and fourth legs of the support structure, and the footpad sleeve for receiving a user's foot in operation to move the first and second elastic cords in a generally vertical direction between retracted and extended configurations.