Alternative methods using only body weight raise many questions. Very good for fitness, this type of exercise quickly show their limits when it comes to muscle with a goal of mass gain.
If you do not have the opportunity to go to the gym, for lack of time, money or taste, you can now practice bodybuilding at home, with a little equipment. Believe me you can train a very good physique with home bodybuilding training, provided you have a method and know what you do (as well as the exercises, the frequency, and your diet).