Fitness needs to be perceived as fun and games or we subconsciously avoid it.
If one tends to be a humorous person and you have a sense of humor the rest of your life then you can certainly lighten the load, I think, by bringing that to your trials and tribulations. It's easy to have a sense of humor when everything is going well.
My two boys were the same ages as the kids in the show. In real life or in between the breaks I was raising two kids off camera who were not unlike the two kids who were being paid to be my kids.
As a father, my first priority is to help my sons set and attain personal goals so they will develop self-confidence and individual strength. Engaging in regular fitness activities with my children helps me fulfill those responsibilities.