Efficient workout I started working out about 2 weeks ago, and I also started learning how to train my body efficiently. My trainer at the gym I go said that I should train only a part of my body everytime I go to the gym. Also, I was taught that the parts of our body can be divided 5 parts of big muscles, pec, back, shoulder, arms, and legs. So I train those muscles by rotation. I will appreciate your any help with this note :)