The L-sit

I feel there is no more effective abdominal exercise than the L-sit; it utilizes all of the upper body and midsection muscles for stabilization and flexion. The key to its effectiveness is that it places the body’s weight further away from its center of mass, creating a challenge for the body to stabilize in this less than adequate lever. And the great thing about L-sits is that you can practice them anywhere, even on creek pipes!