Where does your energy come from?
The most immediately usable chemical for muscular activity is ATP or adenosine triphosphate. Food is converted partially into ATP and is stored in the cells. It is then broken down when your body sends the signal that it needs energy.
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A safe and healthy way to exercise.
When participating in aerobic activity it is important that your heart rate does not exceed it's theoretical maximum.
One common way to figure your theoretical maximum heart rate is to take 220 minus your age. Most people should work out between 55 and 85 percent of this number. These are the top and bottom end of your optimum training zone.
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