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Slight caloric surplus, between 1.5 and 2g of protein per kg daily (studies show that 1-1.5g is enough, but it depends on your health balance and speed to gain muscle) and make sure to get enough micronutrients (especially vitamin C and B6). Good sleep is crucial too.
Well, the sumos have their plan that works, sprinters have theirs, shot put have theirs, football have theirs, basketball; we just ate a ton of everything. It depends on what you do with it. If you just want to look good; steroids with high protein and little or no fat, but it’s hard on your kidneys, liver and pancreas and your gonads will shrink.