15+ Challenge Yourself Fitness Quotes. An estimated 80% of your body's composition is determined by what you eat. Consuming healthy fats, vegetables, and sensible indulgences can help you stay on track. It believes exactly what you tell it—through the words you use to describe yourself, the actions you take to care for yourself, and the choices you make to express yourself. 27/1/2014 · participating in a fitness challenge can help you lose weight, regain health, and increase energy. "if you celebrate your differentness, the world will, too.