Holding a light- to medium-weight dumbbell in each hand, sit on the floor with your knees bent and your feet about a foot and a half from your butt.
Lean slightly back without rounding your spine.
Pull your navel to your spine, exhale, and twist to the left while performing a controlled punch with your right arm. Inhale through center and rotate to the right, punching with the left arm. This completes one full rotation.