No, we're not asking whether you can stand on one foot! We're asking whether you "balance" the amount of food you take in with the amount you burn off.
Maybe you've wondered why some people's bodies are too big and other people's bodies are too thin. There are many reasons why this happens. One reason a person could be big is because he or she eats a lot and doesn't get enough exercise. And one reason a person could be thin is because he or she eats less food than his or her body needs.
Neither person is doing a good job of "balancing" the amount of food they eat with the amount they burn off.
It's sort of like filling a bicycle tire with air. If you either fill it too full of air or don't put in enough air, your bike isn't going to ride right. When you put in just the right amount of air, you get a smooth ride!
It's like that with your body, too. When you eat just the right amount of food for your body to work right and for you to move around, your body will be a healthy size and you'll look and feel good. That means you're doing a good job of balancing the amount of food you eat with the amount you burn off.
If you eat too much and you don't move around enough, your body can get too big and you might not feel good. If you don't eat enough, your body can get too thin and you might not have enough energy to run around and have fun.
Here's some stuff you can do to keep your body in balance:
More cool info on being balanced: