Collaboration, communication, and analytical skills are essential skills for any STEM career. Kickball offers skill-building opportunities in all of those areas. And bonus, there's a dash of math involved in this game too! Measuring the distance between bases, counting up the scores, and keeping a tally on foul balls are solid reinforcement activities for solid math skills.
Outside with a little space...as long as it's safe.
Project Materials List
A ball (of some sort - could be a beach ball, kick ball, balled up bunch of newspaper duct taped together, etc)
Some bases (of some sort - a few sticks, paper plates, rocks, etc)
You really only need 2 players, but if you have more, that's great!
Related Web Links
If you're a stickler for "rules" then this is the link for you. Otherwise, fudge it a little. Who's going to know?
Ideas, Notes, & Tips
Try not to micro-manage the game for the kids. Learning collaboration and conflict resolution on their own will provide a lifetime of value.