Sport is a form of exercise. But the school curriculum is primarily focused on targets and results. It doesn't necessarily want healthy pupils, it wants the best player, or the next athlete. I think it would be good to get children interested in physical exercise like jogging, light weightraining, martial arts, cycling, etc, not because they are sport related but because they are physical activities with which they can get fitter, healthier and stronger and which will see their bodies through old age.