Have them play outside for 20 mins before homework (you can prep dinner during this time).
Then come in for homework. Gives them a break between school &
homework.
They can go back outside to play while you cook dinner.
(You can also have them wash your car etc.)
Eat dinner.
Then we all go outside for a walk together as a family after dinner.
I like the idea of the Wii game.
We don't do organized sports yet.
I'm not personally a fan of trampolines.
If it's too hot outside, have them do the vacuuming & sweeping for activity.
If you have time, you can always drive to the mall then "walk the mall" for exercise. Go from one end to the other & back. No shopping or buying anything. Just air conditioned walking at a good fast pace. This can be done after dinner then come home. It costs gas but at least you can get exercise indoors.
Live by a nearby gym? Sign up your family if cost effective. Then go as a family after dinner for some exercise.
Buy or check out from the library some exercise videos for them to do while you cook dinner. Choose fun ones. You can, also, by some inexpensive ones online from Amazon.