Here's a good case for splurging on your exercise ball: 40-year-old Adam Dunayer was severely injured when the stability ball he was lying on suddenly burst. Adam had a 60-lb weight in each had and was preparing to do a bench press when the ball broke; he hit the ground elbows-first and ended up breaking both of his arms. Now he's got long scars on each arm and has to undergo painful physical therapy to re-learn how to do simple, everyday tasks like opening a bottle.

According to fitness equipment experts, it's natural for exercise balls to wear out over time. But that doesn't mean you should let this happen to you. When you buy a ball for your home, make sure you buy a quality anti-burst one, and replace it after a few years. Watch this video for more tips.