A mobility device comprising: - a top segment ; and - a bottom segment including a first end and a second end , the first end being joined to the top segment, said bottom segment including a curved portion positioned between the first and the second ends, characterized in that : - the first end of the bottom segment and the top segment are connected to each other to include a first angle there between; - the device defines a first flex at a joint of the top segment and the first end of the bottom segment and a second flex at the curved portion; - the joint between the top segment and first end of the bottom segment and the curved portion are adapted to define an energy storing state when force is exerted on the top segment and an energy releasing state when force is released from the top segment; - in the energy storing state, the curved portion defines a first radius of curvature (C1) to define an angle α' between the first end of the bottom segment and the top segment; - in the energy releasing state, the curved portion defines a second radius of curvature (C2) to define an angle α between the first end of the bottom segment and the top segment; and - the first radius of curvature (C1) being greater than the second radius of curvature (C2). - a top segment ; and - a bottom segment including a first end and a second end , the first end being joined to the top segment, said bottom segment including a curved portion positioned between the first and the second ends, characterized in that : - the first end of the bottom segment and the top segment are connected to each other to include a first angle there between; - the device defines a first flex at a joint of the top segment and the first end of the bottom segment and a second flex at the curved portion; - the joint between the top segment and first end of the bottom segment and the curved portion are adapted to define an energy storing state when force is exerted on the top segment and an energy releasing state when force is released from the top segment; - in the energy storing state, the curved portion defines a first radius of curvature (C1) to define an angle α' between the first end of the bottom segment and the top segment; - in the energy releasing state, the curved portion defines a second radius of curvature (C2) to define an angle α between the first end of the bottom segment and the top segment; and - the first radius of curvature (C1) being greater than the second radius of curvature (C2). - the first end of the bottom segment and the top segment are connected to each other to include a first angle there between; - the device defines a first flex at a joint of the top segment and the first end of the bottom segment and a second flex at the curved portion; - the joint between the top segment and first end of the bottom segment and the curved portion are adapted to define an energy storing state when force is exerted on the top segment and an energy releasing state when force is released from the top segment; - in the energy storing state, the curved portion defines a first radius of curvature (C1) to define an angle α' between the first end of the bottom segment and the top segment; - in the energy releasing state, the curved portion defines a second radius of curvature (C2) to define an angle α between the first end of the bottom segment and the top segment; and - the first radius of curvature (C1) being greater than the second radius of curvature (C2). <EOS>