Coach athletics, training ect. Are 90 % mental. The mind decides where the body goes, what speed, what intensity and what duration.
Hypnosis explores these mental buttons if you will. Anything to calm and clear a cluttered or distracted mind is a plus on the athletic field. Mind training is body training. You are obviously a smart coach looking to give your kids an edge, it could only help.
As a world champion bodybuilder in the 70s i used hypnosis, it works. Roger callard