Start by sitting on the floor, with both hands back behind your hips and feet in front of you.
Push into the ground and press the hips up toward the sky, pushing into the ground with your hands and feet.
Imagine you are creating a tabletop position, without letting the hips sag down toward the floor or arch excessively upward.
Slowly lower your hips down toward the floor, and return to the starting tabletop position. Repeat for 30 seconds, and return to the starting position.