This is my situation: I live in a dorm, and due to various reasons(price, overcrowding) I am unable to go to a gym. I am also without dumbbells for the time being. I have a very fast metabolism, and am mainly interested in gaining muscle mass. Is this possible with push-ups, sit-ups, and other simple exercises that do not utilize free weights, and if so, what would be a good routine?
Thanks in advance for all responses.
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