It's wrong to not try and improve yourself.
Tim and Jamie just had a child, and Jamie wants Ted to lose some weight.
Ted has to decide whether to start going to the gym.
Ted wants to be able to see his child grow up, so he starts going to the gym.
Ted realizes that having to go to the gym would not make him happier.
Ted loses a lot of weight and has no trouble with childbearing activities.
Ted gains even more weight and has trouble taking care of his child.