I’ve been given the opportunity as a new personal trainer to take on training a friend’s 14 year old daughter as a “client” over the summer. A 4-6 week program focusing on building her strength as she is active in sports (she does not have a weight issue). Her father is looking for approaches through training that will challenge her and keep her interested. It sounds like motivation is also an issue. Any recommendations/resources any one may know of and can suggest would be greatly appreciated! thank you!