10 things that trigger physical activity and drive:
1. the desire for sexual development.
2. love
3. the desire for fame, power and money
4. music
5. friendship between partners of the same or different sexes
6. a common group of people who join together to get ahead
7. common suffering
8. autosuggestion
9. fear
10. drugs ( and alcohol )
Source: Chapter 11 from "Think and Grow Rich" by Napoleon Hill