Sparring, every time you feel like it you choose 2 people you want to see spar. It can be you and one other person or two other people. They battle it out (in the reply section) until a victor emerges. In case of a long battle (20+ replies) a tie breaker of your choice will decide the winner. Or you can decide to have a battle royale where everyone who wants to participate can fight [same rules apply (special rules are your choice)].