Step 1: Sit on the edge of a non-rolling chair with your knees bent at a 90-degree angle.
Step 2: Grip the arms of the chair.
Step 3: Controlling the movement with your abdominal muscles, lean back and straighten your legs.
Step 4: Return to the starting position and repeat 10 times.
Put together your own office fitness routine by reviewing the exercises in our Workplace Fitness Library.