Ultimate Frisbee is a fast, non-contact sport that requires running and strategizing on the field. It is increasingly popular in Singapore and in other countries but it has yet to be an Olympic sport because it is a non-refereed game.

Basic rules for Ultimate Frisbee
There are two scoring zones at the opposite end of the rectangular field.
Anyone who catches the disc in the scoring zone wins a point for their team.
At one time there will be seven people on the field, 5 males and 2 females.
Substitutes are only allowed after the end of each point unless there is an injury.