I like using the example of the class being quiet for X amount of seconds. If you're quiet, then I'll do a handstand or sing an opera song (or give you extra recess). During our workshop, we played a game of Mother May I- "If you are wearing a purple shirt, take one step forward" or "If you are wearing sandals, take a step back." We talked about using equity sticks or randomly pulling these conditionals out of a bag (to promote equity). I also like using the deck of cards example: If you get a red card, then you get one point. So, if you don't get a red card/pull a black card, then you lose a point.