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Minimizing Stomach Discomfort During Race with Caffeine

I know if I have coffee or a caffeinated drink before a hard workout or running race that there's a clear benefit. I can tell - I can push faster with less effort. The problem is my stomach. I have ...
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Where does energy come from?

When we exercise we burn calories. My question is that, exercising with empty stomach is beneficial or it has no effect? Some people say that you burn more calories with empty stomach. Does calories ...