I don't get why "some" was used before "fresh air."
"Some" means an unspecified amount or number of a thing. English speakers often add the determiner "some" following the verb "get" in casual conversation. For example, if someone wants to go buy apples but the number of apples is unspecified or uncertain, they will naturally say "I'm going to get some apples." Here, we see that the verb "get" precedes "some." If you want to use the verb "get" with an unspecified number of something (like fresh air, in the case of this video), you can use "some." Ex: I want to get some milk and bread at the grocery store. Ex: I think you need to get some exercise.