Step A: Lie faceup on the floor with knees up, feet flat and hands grasping ankles, drawing your heels close to your butt. Inhale, then thrust your belly button up to the sky. Release your hands. Palms up, dig your thumbs into your tailbone and help push your lumbar spine up farther.

 

Step B (advanced pose): Move your hands palms-down beside each ear. Then press up into an inverted U shape. 
Benefits: Improves posture by strengthening the muscles of the spine, which atrophy because we spend more than 90 percent of the day in a slight forward fold. Also strengthens glutes, hamstrings and calves. Stretches abs, shoulders, rib cage and wrists.