How is football anaerobic?

Answer 1

Football is often said to just be a series of sprints. Generally you will not see a single play last longer than 10 seconds, so it is a game basically of anaerobic sprints.

Answer 2

It requires the player to run around on and off (fartleck) for 90 minutes. This obviously being a long time would come under the category of anaerobic, cardiovascular or fartleck specific.