Generally speaking, the younger the athlete, the more aggressive you can be in your training methods. Young athletes tend to be much more teachable, adaptable to stress, better movers, and overall are more capable of learning a broad spectrum of exercises quickly. It is important for us as coaches to look at both the training age (experience level) and biological age of our athletes when writing programs and workouts. Just because you want to learn the kipping pull up and overhead kettlebell swing because you saw it online the CrossFit mainpage is not reason enough for me to teach it to you. Will learning those skills really help you in the direction of your goals?
Put simply, there are well accepted guidelines when it comes to training and physiological principles that exist for good reason- to help us as coaches make informed decisions about how to train our athletes. There’s no reason to break the mold simply for the sake of being different and ignoring convention. Instead, I’d rather learn from great coaches and implement concepts that fit my vision of training and athletic population.