The players should start sitting in a circle numbered 1-4 (this can be adjusted depending upon the size of the group).
The game leader will call out a number and all players with that number will stand up and run clockwise around the circle. After one warm-up lap, the race begins.
A runner is out if another runner passes them on the outside. The run continues until one person is left. The leader then continues to call numbers. A winners round might be a good way to end the game.