Simple relays involve a flag carried around a marker and passed to the next in line, with one to three equal lines of players. But these can be made more complicated and more challenging and interesting. Relays are not demanding - actually in a relay, only one is running at a time, the others, while excitedly cheering their man on, are actually resting. Often times, relays are good time fillers at the end of a session. These games are palyed in a open area usually with defined boundaries.
Some games require much larger areas of space than others.
Tag games involve touching another player who is trying to avoid being touched. Free form games are ones where the players move about freely or within defined limits without a particular organizational structure. Here are some for limited space, and those using circles of chairs and changing places. Here is a game in which the objective is to create a game out of elements selected by dice. It can also be used by a leader to create new games.