Bio Rocket Blast Too often skinny guys are seen pumping away at a fitness center doing 10-15 repetitions per set with weight lighter than an old lady would use. A significant number of repetitions resulting in a large pump is good, but high quantity pumping doesn't always help your muscles to put. Keep the number of reps less preferably between 7-10. In order to build muscle mass, you need to give muscle tissues a reason to vegetable. Train with heavy weights to the point where you physically can't perform another rep WITH GOOD FORM - reps carried out with terrible form don't count and can also lead to injury.

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