How do you measure results? Wins & loses? Improvement? Perfect effort?
Different muscles perform different functions depending on the demands of the activities.
Bad training methodology enhanced by advanced technology and supported by sophisticated analytics is still bad training.
If you meet someone with all the answers walk away. Find someone with all the questions and you will learn something.
It would be interesting to ask Olympic champions in Track & Field what they were doing when they were 12 years old?
Evaluation of movement ability – look at the shapes, postures and positions you have to make in the sport and look at what you can do and then reconcile the two.