On 12-inch two-by-fours, write a number on one end and an exercise on another.
Numbers and movements can be combined simply:
2 Squats = draw the board, do two squats.
Or in a more complicated way:
Add the number to the last number drawn, and do that many squats
2 Squats (last board drawn)
3 Pushups (current board) = do 5 pushups
Or combined into a workout:
3 pushups / 5 situps / 10 squats – draw a board (ignore the writing on the board)
When the tower falls, the last player does 5 burpees while the others rebuild it.