I have decided to take over my 17 year old son's weight training/weight gain program. we feel he needs to put on about 20 to 30 lbs of muscle before next summer. had a very bad year in football, concussion and shoulder injury. i feel bulking him up will allow him more opportunity to play the all out footbal he likes. need help on weight training and weight gain. currently he is about 6' and weighs approx 160lbs.