If you find out you can let me know. I think I'm about Level 11. I like to see those points mount up, but I found myself spending way too much time on SP. I have to back off and pay more attention to the rest of my life. Right now I'm trying to find balance.
Don't forget, there's more to life and to SP than accumulating points. Focus on learning how to be healthy more than points. Points are external motivations that help you get started, but internal motivations will be the ones to help you go the distance in your journey to better health.