Weight Training for Youth Athletes

How to weight train for youth athletes. When should strength training start? What age to start to weight training? What exercises to use?
This is a clip from Coach Mike Boyle from his 'Complete Youth Training' course. For information on Mike Boyle's Complete Youth Training course, go here: completeyoutht...
Coach Mike Boyle was the Strength & Conditioning Coach for the 2013 World Series Champion Boston Red Sox, and former S&C Coach for the Boston Bruins, BU Hockey, New England Revolution, Gold Medal US Women's Olympic Hockey Team, plus has coached many National and World Champions and professional players in Football, Basketball, Baseball, Soccer, Ice Hockey, Rowing, Judo, and Gymnastics.