School is out and I am taking my 2 boys 12 and 15 to the gym. I need some tips on a program for them. I know the 12 y/o is to young for free weights, the 15 y/o wants to build upper body and legs for highschool baseball. Both are in good shape and the youngest is hard to keep up with. Very active all the time. They are both in sports and really show interest in going to the gym. Thanks guys.