The Athletics Stadium

You're doing athletics to train for a upcoming tournament,when the teacher comes frightened,and running from a zombie.More zombies appear out of nowhere surrounding the teacher,thus eating her.Hide in the stadium until help arrives.There's a back door near the south so you can enter the stadium,instead of entering the front entrance.

P.S.:Be careful NOT to stay outside too long because it can get serious after two minutes.(Especially when there are a lot of infected people)