The Desk Chair Swivel
Step 1: Sit up straight in a chair that swivels.
Step 2: Hold on to the edge of your desk with your fingers and thumbs.
Step 3: Lift your feet up so they are just hovering above the floor.
Step 4: Using your stomach muscles – not your arms – make your chair swivel from side to side.
Step 5: Swish back and forth for 15 rounds.