You'll hear Arnold Schwarzenegger expressing his lifelong commitment to training and feeling good, and how he'll be pumping iron until the day he dies. For similar reasons, Tim, Steve, and millions of others train in martial arts.

Personal growth, self-improvement, and as Tim talks about — becoming a better person and fulfilling our responsibilities as stewards of the Earth — are just some reasons why it's so healthy to find a passion you can practice your entire life.