Ironman champion Chrissie Wellington published The Importance of R&R. But I cannot say this clearly enough: It is not the swim/bike/run sessions that will make you fitter; it is the recovery — the adaptation and regeneration from the stress caused by those activities. And it is not just about physical recovery, it’s mental recovery/relaxation too.
Chrissie Wellington is an Ironman champion. She wrote an article for CNN talking about the importance of training your mind while you are training your body. Ironman Champ: Your Mind Matters More