So this method works: every time you go to the gym you should try to lift more weight than the previous day, the more you try harder, the harder max testo xl you'll get, the stronger you'll do, the more muscle you'll have.
The way you increase your muscle mass will depend on several important factors like: the type of exercise you do, the type of body you have, how much sleep, your diet and the supplements you use, to achieve this goal.