Ultimate is sometimes called Frisbee football, but it's really more like soccer, especially from a cardiovascular perspective. It was invented by some New Jersey high-school students in 1968 and went on to spread through the country and to some extent through the world. Official games have seven players on each side on a field that is 40 by 70 yards, not counting two end zones that are each 25 yards deep. The teams line up on opposite goal lines and one throws off to the other, as with the kickoff in football. But there the similarity to that game ends.
Action is continuous.
If you catch a pass, you stop short, pivot on your heel and pass the Frisbee in turn to another player, one who is preferably further up the field. To score, a team has to pass the Frisbee across the goal line. Then finally play stops, and the teams return to opposite ends of the field to start another point. This is usually a good time for the paramedics to come in and tidy up the likes of me. Like other team athletes, ultimate players scream.