The Key to most endeavours is to train both the body and the mind. We really are just at the kindergarten level of understanding them. But, what we do understand is that they are inextricably linked and dependent. In whatever field the most successful are those who understand that dependence and train both so as to achieve a harmony of purpose and performance. Unfortunately many, maybe most, people do not understand this mutual dependence and the value of harmony so they lose out on achieving their full potential.