Biggest Exercise Blunders

Climb on the StairMaster or treadmill and you'll burn calories -- but only if you use the machine the right way. Focus on moving your legs, and leave your arms out of the picture as much as possible.

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• Hold the bars lightly or just touch them briefly when you need to balance.
• Face straight ahead, shoulders back and abs tight.
• On the StairMaster, keep your entire foot flat on the pedal as much as possible.

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• Leaning on the side rails and supporting your body weight with your hands.
• Going so fast you have to hold on to keep up.
• Standing on your toes, which can aggravate your Achilles tendon.