I am not sure if anyone has thought of or even carried out this idea before, but I sudddenly thought of a sport based off offstring yoyos.
So basically, this game works something like captain’s ball, with the offstring yoyo replacing the ball. Each player is equipped with a string, and the goal of each team is to pass the yoyo to their goal catcher, who then has to catch the yoyo behind his or her back (for some challenge).
If the yoyo dies out, then the other team would get possession of the yoyo, and re-throw it. This basically means that regenerations would have to be done often.
This might actually be fun, as I foresee players doing cool moves, and whipping the yoyo in mid-air, etc.