I do know from riding a racing bike for 100 mile that you need carb replacement every 30-45 minutes or you will do something called a "bonk", which means your mind stops working effectively and you can even pass out. I've almost done that before. But I was never concerned with burning muscle. That might happen if you worked out for days at a time but you'd probably bonk many times before hand!
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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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