Kris Humphries has a physique that many men would kill to have. His active lifestyle, healthy eating and career help him to stay in tip top shape. However, the Brooklyn Nets star knows that childhood obesity is a huge problem in the United States. Which is why he's hosting the Kris Humphries Challenge For Kids. 50 local kids in Brooklyn recently spent a day playing basketball, doing sprints and working on their fitness with Humphries.