My oldest DD has a bit of a weight problem. it isn't horrible, she just gets tubby really easily. during the school year, sheis involved in a bunch of extra curriculars that keep her physically active (volleyball club, choir, etc) and she also has recess, so she get plenty of exercise. During the summer, it is not the same, so she always gains a bunch of weight. There really isn't any low cost local thing she can do-everythig always costs an arm and a leg, and it is too hot to go to the park or have her running aorund outside.
And it isn't like She is getting filled full of junk food. I only buy fruits and veggies for snacks (don't do anything but rice vinegar for saucs, since it has zero claories), do lean meats and veggies for dinner, etc. Everybody else in the fmily is a normal, healthy weight. She just happens to be the heavy one.
We are trying out zumba for a bit to see if that helps, but I can't wait for school to start so that she can run some of this stuff off.