Yes, they can be. With an exercise class, you have a set time to exercise. Along with that, you can make a lot of friends who will encourage you to exercise with them!

I would get a small dog or a cat for them.

By allowing them to socialize with people their own age and getting exercise.

encourage your child to stay fit by doing regular exercise and eating healthy.

Firstly, I will encourage him/her to have more food, and then to have more exercise in daily life.