When you exercise do you have to sweat to lose weight/gain muscle?

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Question by Brandon: When you exercise do you have to sweat to lose weight/gain muscle?
Hello, everyone. I'm 14 years old (about to be 15) and weigh 200 pounds. I've been working out pretty hard on the total gym 1500 and haven't broken a sweat yet this week. I can feel it in my arms though that it's working. My question to you is when you exercise do you have to break a sweat to lose weight/gain muscle? Thanks for

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