I actually think being a more balanced person makes a healthier, happier, and thus faster person. The question I try and ask myself when I consider whether or not to train more is what is my body craving and what is my body ready to absorb? Sometimes pushing harder is not the answer. It takes self control, confidence, and intuition to know when to train and when to rest, but when in question error on the side of being over rested.
Ryan Hall, The Extra 1%, competitor.com