Exercise device

An exercise device comprising:

• a body, the body having a top, a bottom, a first end located at one edge of the body, a second end located at an opposite end of the body, and first and second sides extending between the first and second ends;
• first and second axles connected to and rotationally locked to first and second wheels, respectively, the first and second wheels able to rotate both in clockwise and counterclockwise directions in relation to the body, the first axle also connected to the body proximate the first end at a first hub and the second axle also connected to the body proximate the second end at a second hub;
• a first spring with a wheel end and a hub end, the first spring positioned at least partially within the first axle, with
• the first spring wheel end slidably connected to the first wheel at a first wheel junction, wherein the first wheel junction is configured to convey torque between the first wheel and the first spring wheel end, and
• the first spring hub end slidably connected to the first hub at a first hub junction, wherein the first hub junction is configured to convey torque between the first hub and the first spring hub end;
• and
• a second spring with a wheel end and a hub end, the second spring positioned at least partially within the second axle, with
• the second spring wheel end slidably connected to the second wheel at a second wheel junction, wherein the second wheel junction is configured to convey torque between the second wheel and the second spring wheel end, and
• the second spring hub end slidably connected to the second hub at a second hub junction, wherein the second hub junction is configured to convey torque between the second hub and the second spring hub end;
• when the first and second wheels are rotated against respective first and second spring torques, energy is stored in the first and second springs and the first and second springs apply restoring torque to the first and second wheels, respectively.