The 100 percent rule

100% commitment is easier than 98% commitment. Period.

Cuz once you take a decision, you avoid decision fatigue. For ex- When you decide that you will wake up at 5, you do not snooze. But becuase you have not truly decided the waking up at 5, you have the decision fatigue and you snooze. So, learn to commit fully. Decision fatigue is will power, when you commit 100%, you save your will power. 

Will power often doesn't work.