Our health is the most important thing in our life. Many people in the world suffer from poor health, and it affects everything they do from how they get out of bed, what they can eat, and what activities they can do. Physical activity also helps people with their mental health enabling them to challenge themselves and motivate themselves to better careers, better situations, and better lives. The people who work in fitness and health are the motivators behind helping people make these amazing changes. Here are four careers in fitness that change lives.