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You got very good results on such a light work out (it's not a swipe at you), you're one of those lucky people who burn calories very fast, so you do need to worry about what you.
But... If you'd really like to build up muscles, you will need to work much more then that. They will grow, but only to a certain point. After that, you will need to gradually increase the amount of time you spend working out.
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