Also on these boards
Incline Hip Twist Place hands shoulder-width apart on the seat of your chair and walk your feet back to a plank position, bracing your abs in tight. Use your core to lift your hips up slightly, and then rotate your left hip down to tap the edge of the seat lightly, pivoting on your toes. Lift hips and return to center. Repeat, alternating sides each time, for a total of 20 reps.
The 100 Workout - something to do at the gym. except i dont want to do 100 jumping jacks in public.