With acting, if you audition terribly, at least you know, 'I messed that up. I was horrible. That's why I didn't get the job.' With modeling, it's like, 'I'm not cool this year; therefore, I'm unemployed for a while.' With modeling, it's just, either you're liked, or you're not.
The good thing about kids is they want to be mobile; they want to be running around nonstop. They want to play. They want to be outside. So they're inherently more active than we are, because we get much lazier as we get older. Part of being a parent is keeping up with your kid.