1. Have a Routine Physical -Visit your doctor before beginning a   new exerciseprogram. Any new activity can stress your body. If   you have undiagnosed heart disease or other conditions, you   should modify your exercise accordingly. Your doctor can let you   know what your limits might be and suggest an appropriate amount   of exercise for you.

  2. Gradually Increase Time and Intensity- When starting an   exercise program, many people have lots of enthusiasm initially,   and go too hard, too soon. Begin with moderate exercise of about   20 mintues, 3 times a week and gradually build upon this.

6. Drink Before You Exercise- Dehydration can kill your performance, so stay well hydrated. Try to drink 16 oz. of water in the two hours before your workout and then take in water during your workout to replace any lost fluids

7. Listen to Your body- If you experience any sharp pain, weakness or light-headedness during exercise, pay attention. This is your body's signal that something is wrong and you should stop exercise. Pushing through acute pain is the fastest way to develop a severe or chronic injury. If you don't feel well, you should take some time off until your body heals.