The Goldilocks Rule can teach you everything you need to know about why you give up when tackling a new project or skill. 

If you want to reach peak cognitive focus, you want to work at a level just outside of your comfort zone. 

When author James Clear talks about The Goldilocks Rule, he often relates it to tennis. 

You don't want to play against Serena Williams because you're going to get utterly destroyed. You'd get so disheartened that you'd want to smash your racquet. 

But you'd also don't want to play against a 5 year-old because you'd get bored to death. 

You need to find your personal sweet spot. Experts say that your sweet spot is about 4% higher than your level of competence. 

Not too easy, not too difficult – just right.