It felt good to get into some open space and just let my brain go. I think this is undervalued, generally. It's indisputable that intense training wears on your mind as well as your muscles, making it harder to concentrate and get up for big physical challenges. This goes to the heart of the varied intensity training philosophy. Just as the volume of physical work should vary between low medium and high during the course of a given week and a given training cycle, so should the volume of mental work vary. I believe that when people plateau or burn out, it's largely a result of mental exhaustion. Therefore, days like today are really important. For me, they recharge my nervous system, relieve my stress, and get me itching for the next big thing.