Guys, I'm going to start training my 11 year old son when his season is over in 2 weeks. I'm going to start him out on all bodyweight exercises (3 times a week) like pushups, chinups, bench dips, medicine ball throws, lunges, stepups(18" box), 45 degree hyperextensions, and hill sprints( twice a week on a 40 degree, 20 yard hill). Crunches & planks will be done after each session with jump ropes as a warm up. He's 5'5" 135lbs and plays defensive tackle. Is there anything else I missed that would be beneficial? Thanks in advance for all your help!!