Come into a low boat position, belly squeezed inward. Bring thighs and shins into a 90° position and press your hands against your thigh and your thigh against your hands. Extend the other leg and move it towards the ground and back towards the ceiling.
Abs
Negative Crunch
Lie on your back, chins and thighs are in 90 degrees or slightly more, also your thighs and your upper back are 90 degrees or a little bit more. Arms are next to your body. Read more…