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Before You Start
Talk with your doctor before beginning any exercise program. Do not exercise if you have any physical problems that might influence your ability to become more active. Stop exercising and call your doctor if you feel dizzy, nauseated, short of breath, or if you feel pain in your chest. If you are more than 40 pounds overweight, you should not work out at a high intensity level without professional supervision.
Read our comprehensive
safety tips before starting.