I workout evry major body part twice a week. For example, bi+tri on tuesday and friday. However, the excercises that I do on Tuesday for bi+tri are different from the excercises that I do for my bi+tri workout on thursday. I do this so that I hit and train different parts of the arm. I used to stick to just the same workouts evry time, i did that for my first 4 months and I put on about 9 pounds. Now i started this routine and I feel great, but i am working out right? Im only 145 pounds, but im about 5'6 and i look very fit, but im scared that after about 6- 12 months of this training, i wont be able to grow after that, since my body would have mastered several workouts and would not be shocked anymore, or is that impossible since there are so many workouts and so many shock principles to use? Please help, can't you see im going crazy!