Okay, yes, that hamburger may well be a good choice. Xtreme Muscle ProThat is because it is full of the proteins your body needs. However, and this is a big deal, you have to up the quality here. Fatty meats will not help you. Do not forget that beef is rich in iron and zinc. Both of these are necessary to build muscles. On top of that, beef is a wonderful source of creatine. Try to find loins of beef instead of those fatty types. That keeps the calorie count down. Moreover, add at least a green vegetable if not additional carbs.