Audio on willpower courtesy of the BBC.

Interesting IMO and a good listen. Not too long either.

Quick notes:

1. It is easy to overwhelm the will power part of the brain.
2. However, like a muscle, it can be strengthened.
3. Simple unrelated tasks can build willpower - even always sitting up straight will build up willpower.
4. Gritting your teeth doggedly and continuing with said task will not strengthen your willpower, but distracting yourself will.