Exercise device

An exercise device comprising:

• a first side having a convex surface;
• a second side opposing the first side, the second side having a surface;
• a first rounded end having a first radius;
• a second rounded end having a second radius;
• an arc of the first rounded end defined by the first radius;
• an arc of the second rounded end defined by the second radius;
• the convex surface of the first side having an arc defined by a third radius;
• wherein the first side surface has a first end and a second end and the first side first end is connected to the first arc and the first side second end is connected to the second arc;
• wherein the second side has a first end and a second end and the second side first end is connected to the first arc and the second side second end is connected to the second arc;
• wherein the first radius is larger than the second radius;
• and
• wherein the radius of the first side convex surface is greater than the first radius and the second radius.