Start on your back and raise knees as close to 90 degrees as your flexibility allows.
Tuck chin slightly and reach hands up as high as you can toward your ankles. Keep your eyes focused toward your knees.
From that position, reach your arms up and strong behind your ears. Reach toward the wall behind you and lock arms out.
Point your feet and squeeze quads straight. Lower legs as low as you can, making sure there is no arch in your lower back.
Keep back into the ground and belly button pulled in toward the floor for 20 seconds. Increase the length of your hold by at least one second with each round.