Setup: Plenty of floor space.
Position: Lay on your side, straight body with legs stacked and resting on your forearm.
Movement: Raise your body off the floor so that the only points of contact are the side of the bottom foot and your elbow/forearm. Hold your body straight for the requried time. A variation is to bend at the waist up and down and/or to hold the top leg up and straighten out the top arm.
