I really wish I had not wasted so much time running in my younger days. Lifting is what I should have been doing all along. For teens, this is a no-brainer, spending an hour in an activity where you can measure your progress every day. At a gym you hang around impressive people who work hard at life. You learn to push yourself consistently and to define success by how much you've improved.
Push the mathematics and push the gym and your son will be ready to make a difference when it's his time.
Push the mathematics and push the gym and your son will be ready to make a difference when it's his time.