Recently, my buddy John Hittler (founder of Evoking Genius, and a great leadership coach) released a book called The Motivation Trap. Inc says it's one of the 10 leadership books that should be on your radar going into 2019.
The premise is that motivation is an exhaustible resource ... it can be used in spurts, but isn't a good long-term strategy. Sustainble success takes a more nuanced approach.
Instead of trying to tell you more about it, I went ahead and shot a video with him, to let him explain. Check it out.
This book (and Benjamin Hardy's book) recognizes that it's hard to fight mother nature.
Understanding the natural path is a lot easier than fighting it.