To have that body with muscles it is important to have an important knowledge about what you should eat before doing your exercise routines and raise muscle mass.
Some months training and pulling iron without seeing results or changes in your physical appearance and you come to believe that your case has no solution. How to have a muscular and defined body is for many important men and they come to think that they can never fill their shirt, with their chest or biceps, with big muscles and even blame the weak genetic inheritance to justify the low performance.
However, before you get to despair, give up or lose the will to keep good and healthy, make sure that you are correctly following some basic care in your training and providing enough energy (food) for recovery and muscle gain. Yes, the food is the same, if not more important than the amount of weight you lift in the gym