THe more you use, the more you gain. But without using your muscles they'll become weaker.
When you're working out, your body is able to burn the foods you ate. Thus balancing out your intake and output.
While working out your brain releases Dopamine- a chemical that makes you happy.
After a good work out, you'll feel exhausted but given some time you'll feel like you could do anything
Without exercise your body doesn't know what to do with all the stored energy, so it makes you sleepy.
Improve your Mood
U.S. Obesity Rates
Why is Health important?
When You Exercise
When you Don't Exercise
Fit for Life
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Working out helps you think more clearly, so without exercise you tend not to think as clearly causing you to become stressed.