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ou won't lose muscle mass if the cardio you do is below 80% of your heart max. That's the point where your body is using equal parts of fat and sugar for fuel. Higher intensity burns more sugar, which will run out without some sort of food or sports drink. And you can train your body to process fat more effectively, which in turn makes you more efficiant above 80%.
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If you're wringing your hands you can't roll up your shirt sleeves.
Stangers have the best candy.
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