In this exercise, the muscles in your stomach contract in the same way as they do during a sit-up. You should feel them move in as you tighten them and release to an expanded position when you relax. This exercise can be done anywhere.
Step 1: Sit in a relaxed position in your chair with your feet on the floor, making sure your waist or back does not collapse or arch.
Step 2: While exhaling, pull in and tighten your stomach muscles.
Step 3: Relax and inhale.
Step 4: Repeat 10 times. When you get to the 10th repetition, hold your muscles in for an extra count before releasing.
Excerpted from Get Fit While You Sit © 1999 by Charlene Torkelson. All rights reserved.
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See the complete library of Workplace Fitness exercises.