Balance is key: I need to be successful in my career to feel fulfilled, be surrounded by people I care about to share it with, and have my health to be able to do the things I love to do!
They both go together; you can't be in front of the camera hosting a fitness television show in front of 75 million households and not have trained 6 days per week year round - in a bikini no less.
When I meet successful people I ask 100 questions as to what they attribute their success to. It is usually the same: persistence, hard work and hiring good people.