Working out isn't all for looks . . . at least not for me.
Working for endurance allows us to go about our daily life activities without giving out as quickly. You can lift your child more often, you can sweep more, you can carry in more groceries, do more gardening . . . and so on.
I can't win a race on speed, but I'll go toe-to-toe with anyone on how long I could keep moving before I drop! If I just looked good and had to sit around and watch life pass me by, what good would it be?