When you want something bad enough, you do it. And when the reward is greater than what you put into it you're motivated to. I do housework because it bothers me to have a messy house and because I find the unpleasant aspect of doing housework preferable over having mold/bugs/dust/etc. I go to the gym because it makes me feel better and makes me look good, and taking that time out of my day is better than not going and feeling yucky. I go to work because I need money, which is preferable to having none and not being able to afford the life I want. Etc...