Salva is walking with the lost boys of Sudan to a refugee camp.
That was a hard and tough thing to go through. It involved lots of mental toughness, motivation, and work ethic. Think of walking miles and miles with no vehicles or shoes water, food, or shelter. Think of the pain of not knowing if you would see your family or friends again! Salva used his mental toughness to survive.
Even though Salva had almost no food, water, shelter, and shoes he still used his mental toughness. His mental toughness allowed him to keep going and try harder. When he was separated from his family and had no clue if he was going to survive, yet he kept trying. Salva used his motivation to survive