Recently I've been putting a lot of QM (quadrupedal movement) into my training. It's great for developing quad strength, and can be turned into a group activity too. There are some great games to play, and my friends and I have been doing a lot of them. After experiencing some nasty scrapes on my hands, I'd recommend doing it on grass until you become more confident with your hand placement before moving onto concrete. Some favorites games are:
QM Tag - Self explanatory
QM Freeze Tag - Same as tag, however, when someone is tagged they freeze in place. The objective is for the "it" person to freeze everybody. People who are not it can unfreeze teammates, and the game goes on until everybody is frozen.
QM Capture the Flag - Played in teams; each team tries to steal the other team's flag (or water bottle, whichever). Once on the opponent's side of the field, a player can be tagged, and when tagged, has to QM back to their side. There is a safe area around your own flag in which you cannot enter (so the flag stealer gets a break before sprinting back), and only 1 person can closely guard the flag at once.
QM Duel: My favorite game. 1v1 tag matchups between two traceurs of similar speed and stamina. A time limit is set, and the two tag and counter tag until time runs out.
There are a couple rules in common: No movement except for QM and rolls, a person may stand up to rest only if they stay still in one spot and no tagging someone back immediately after they tag you.
Has anybody else tried some QM games before? How was it, and what other games can you suggest?