Reesy

I'm a rugby player and had to start weights at 14 to get stronger. I feel the 'bodybuilding' workouts like compound lifts give enough strength to get through a game and be a lot stronger than others. I don't know what level you play at, but at 16, power will come from the training you do with the team. Strength from the gym will help you in training. Only when you get into a very high level, then that explosive power will start to make a difference.

I wouldn't be overly pedantic about doing 'explosive' training. Speaking from experience, most rugby players i know stick to the bench, squats, chins etc and improve their power outside of the gym and on the pitch. This power comes from bag work, lineouts, tackling and circuits.

Rugby is a combination of strength, power and mass. If you weigh 8 stone, you aint gonna bring a forward down no matter how 'explosive' you are.