Sit in the center of your mat, knees bent, feet hip-distance apart. Bend your elbows and make a fist with each hand. Stack your fists on top of one another in front of your chest. Begin circling your fists around each other. Inhale and curl your tailbone under, scooping the abdominals in, and roll down towards the mat. Stop before touching the mat. Exhale as you round back up, winding arms in the opposite direction. Repeat four more times.