On Saturday afternoon there is a 50/50 chance that I am either wrestling with a 4 and 5 year old or have passed out after sitting. There is no in between and I can transition between the two at any moment depending almost entirely on what the kids are doing.
May I suggest sock tag - use a rolled up sock (or something similarly soft). Kid runs around while you try to tag them with the sock. Similar to dodgeball, but no one should get hurt and you get to sit or lay down while they burn off energy.