I read about how important energy is, how energy management is key to everything. And the best way I read is to manage energy and not crash by the end of the day which can give that balance you need to keep going everyday without wavering from your goal(s).
But I seldom read about how to replenish energy effectively or how to have enough energy that by the end of the day you don't crash but have enough energy to keep doing things you want to do.