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theres no reason why you cant lose fat and gain muscle at the same time, just go for it.

try training your biceps only once a week, you may be overtraining

stop worrying, your doing nothing wrong, the pump always goes away after a few hours, you will never see a sudden increase in growth, you just have to wait for the muscles to gradually grow.

you know your a gym idiot when you spring your legs up and down when doing barbell curls (I've seen people at my gym do this, its f**king funny to see)