For people with submissive tendencies, being rewarded and punished by a dominant to shape behaviour could be an effective way to be motivated. Doing things you should be would be a sexual pleasing-my-master type of enjoyment, and when you make mistakes or fail to meet your goals perhaps punishment could reduce giving up or being demotivated for too long.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.