i'm 16 and i do cardio 30 minutes every other day, i do it on the same day i do my whole lower leg workout on machines, 3 sets 10 rep, and on the even days i do all upper body workout and abs, just wondering how many excersises do i have to perform on that muscle group? say i'm doing upper body, and i just did biceps 3 set of 10 rep, would i have to do another excersise on biceps? and then move on to triceps and do the same amount of different excercise for that muscle group?