Start With Small (or Fun) Consequences
With my younger classes, I play "Gaga Ball: Aww Man Style." When you get hit, you just throw your hands up in the air, shout out "AWWW MAN" (preferably in a funny accent), then return to the game. Then I add that they have to touch a wall after yelling it. Then touch a wall and do a push up or spin in 3 circles.
Make the consequences short: Any time they're sitting for longer than a minute or two, boredom kicks in, and they start finding "creative" uses of that time which are never what we want them to do. One way I do this is with a JAIL (where you go to the back of the line when you're out and the first person in line goes in). Sometimes, if there's too many in jail, I'll do multiple jails. If you get out, you go to your jail and the first person in that line goes in (side note: just because you share a jail doesn't mean you're on the same team #justlikereallife). Another solution is to have timed elimination rounds. I'll play "TWO MINUTE TO WIN IT" versions where a new game starts every 2 minutes.