I enjoy doing heaps of "Diamond Push-Ups" you don't need to be in a gym or have excess to equipment, so you can do them basically do them anywhere. I'm convinced they add bulk to the back of the...
1- Lift heavy weights, changing the routine now and again (don't keep doing the same thing over and over again.)
2- Eat well, very low sugar, watch your fat intake but keep the protein intake high....