Reference: http://en.wikipedia.org/wiki/Physical_exercise
Summary: Exercise can be used for lots of things. For one, it can be used to lose weight, strengthen muscles, or even just for enjoyment. Frequent Exercise can boot your immune system and help prevent type 2 diabetes and obesity. It can improve mental health and self esteem.
Critique: I think that more people should exercise because it is good for them. It can also prevent depression, which means fewer deaths.
Impact: The impact that exercise has on the world is a good one because if more people exercise, there will be less obese people/children and a healthier more fit world.
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