Using the combined, integrated force of the mind and body is more efficient than using one without the other. Since the body can only exist in the present, that's where the mind should be too (unless we deliberately choose to contemplate the past or future). At the same time, the body needs to be healthy and in optimum operating condition so that it can respond effectively to the mind's directives.
We live in a world where most people still subscribe to the belief that shame is a good tool for keeping people in line. Not only is this wrong, but it’s dangerous. Shame is highly correlated with addiction, violence, aggression, depression, eating disorders, and bullying.