Here's a great way to prevent "office chair spread."
Step 1: Sit in your chair, lie on your back, or stand up with your feet slightly apart.
Step 2: Squeeze your buttocks as tight as you can.
Step 3: Hold for five to ten seconds.
Step 4: Repeat as many times as you'd like throughout the day.
This one's so easy, you can do it while you're on the phone or gazing at your computer screen.
See the complete library of Workplace Fitness exercises.