Have the kid swim in the pool and the body skill should go up. Or another way is to get the career reward from the military track (which is the obstacle course) and have the kid run in it, that works too.
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Three ways...
1.)Earn enough reward points to get the "fast metabolism" option on the rewards menu (which should be 5,000). Its hard to earn these points, though, since they are children and don't have a lot of goals.
2.)Make them excersise in front of the television. Doing this makes them slim, but also makes them more muscular later in life, so you have to premeditate whether you want that or not.
3.)If someone in your household has enough reward points (I think it is 30,000 points) to get a body sculptor, get it! It's easiest, but there are two things you have to wait for. Sometimes it messes up, and it also has to warm-up in between size changing. Once you actually get it, look in the BUY section of options, in the family inventory.
I hope this helped!
Have them work out in front of a stereo or tv until the fitness bar is at maximum capacity