Burning 100 calories isn't overly challenging -- a 15-minute run here, a couple hours of vacuuming there. But burning 500 calories requires quite a bit more effort -- and anyone who pays attention to the 'calories burned' sign on the elliptical or treadmill knows that.

Shape magazine recently revealed some ways to burn 500 calories:

• Play golf for an hour and 45 minutes
• Row for 55 minutes
• Box for 45 minutes
• Take an hour-long aerobics class
• Do this yoga routine that Bev told us about a while ago.

That doesn't sound too hard, right? And remember, burning an extra 500 calories a day will help you lose one pound a week.