Eat a moderate amount, push yourself lifting, and maybe do light cardio.
You will not get big unless you are eating big, plain and simple. When I hit the gym hard for 3-4 months without breaking my routine (A/B/off -repeat) I didn't really gain any weight, but I looked a whole lot better and was definitely a good deal stronger. I would have gained a good deal more weight/muscle, but I didnt eat much more than normal... which was my biggest problem.
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