A powerful athlete is not a strong athlete, but one who can exert his strength quickly. Since power equals force times speed, if the athlete learns to make faster movements he increases his power, even though the contractile pulling strength of his muscles remains unchanged. Thus, a smaller man who can swing faster may hit as hard or as far as the heavier man who swings slowly.
Bruce LeeThe biggest adversary in our life is ourselves. We are what we are, in a sense, because of the dominating thoughts we allow to gather in our head. All concepts of self-improvement, all actions and paths we take, relate solely to our abstract image of ourselves. Life is limited only by how we really see ourselves and feel about our being. A great deal of pure self-knowledge and inner understanding allows us to lay an all-important foundation for the structure of our life from which we can perceive and take the right avenues.
Bruce Lee