Sidewalk dilemma
This one will challenge your awareness of basic body position and momentum. It will also test your ability to read the posture and momentum of others in your vicinity. You might play this game in a martial art setting, but it will work almost anywhere. It's also a good team-builder.
The simplest form of this game is played with two people. Simply take up positions on opposite sides of the room and start walking towards one another. Imagine that you're walking on a standard sidewalk, maybe 3 feet wide. The objective is simple: somehow, you'll have to figure out how to pass your partner without a collision.
As you approach your partner, there'll come a key moment when you'll have to make a choice between left and right. Whatever your inclination, be ready to change your mind (change your body) if things aren't working out as you had planned.
(Note: However you make the pass is up to you. You can go face-to-face, back-to-face, or back-to-back. As long as it's smooth, you're doing it right.)
This game is valuable because it forces us to bypass conscious deliberation. You can't plan ahead and you can't calculate. The best strategy is to simply throw yourself into the predicament and trust your body to sort it out. And, in the vast majority of cases, it does just fine.
There are plenty of variations here. For example, you can narrow the "sidewalk." And, you don't necessarily need to limit it to two people. You could set it up like a real-life sidewalk, with lots of people trying to bypass one another. And, once you really have a rapport going, you can increase the speed.
The sidewalk dilemma is not a "fitness activity" in the popular sense. You won't work up a sweat or build up any muscular strength, but that doesn't matter. It will bring you into the here and now, which is plenty valuable in its own right. Plus, it's a lot of fun.
