A

SETUP Lie faceup, legs together, knees bent, heels pressed into mat, feet flexed. Place hands behind thighs; inhale, drawing abs in and up as you lift head and shoulders off mat. Continue to curl upward, as if peeling your spine off the mat.

B

ACTION Exhale as you round forward over legs, straightening knees while keeping feet flexed and hands still behind your thighs. Reverse the action, curling back onto mat and bending knees as your lower back touches the mat, and repeat.