Play doesn't have to be pleasurable. The notion that life wasn't meant to be easy and if we keep avoiding pain we are essentially avoiding life. Understanding this concept about internal triggers has given me a really fresh perspective on life in general.
The idea of making pacts was also really helpful in terms of sticking to it. I am a vegetarian, I don't drink, I am a runner - all part of my identity and all things that I have stuck to for decades. Now I understand why.