I second this. "The Power of Full Engagement" is a rather good book on how to manage your energy. I like Cal Newport's blog, but what I think often goes unmentioned is the energy required to sustain this regime. It's not going to happen over night.
Schwartz and Loehr worked with some of the best tennis players of all time. From there they built a system of how to build up your energy (energy is the term they use.) Some might find their work to be a bit hokey, but I got the book used for $.01 (+ s&H) on Amazon so it's worth a shot.
The deliberative practice literature is pretty consistent on what people do to become better performers. What much of the literature (or at least what I have read) lacks is the recognition that getting to the point of being able to practice deliberately in a consistent manner takes building up endurance over time.
http://hbr.org/2007/10/manage-your-energy-not-your-time/ar/1 (paywalled, unfortunately)