What is an easy exercise plan for an overweight 12 year old?

All humans of every age are on a "diet."

Perhaps you actually want to know whether an overweight 12-year-old should be placed on a restricted diet. The answer: Yes. The 12-year-old should be restricted to eating healthy food.

The same answer applies in the case of non-overweight 12 year olds. Humans should eat healthy food, humans should practice portion control, and good health habits established in childhood tend to carry over into adulthood.

--Mom of seven who hasn't lost one yet.