As is the subordinating conjunction. It transitions between the two main ideas in the sentence. The first main idea is the squad and speaker stretching. The second idea is the pep band playing. Subordinating conjunctions often tell you time. In this case, as tells you that the stretching is happening at the same time the band starts to play.
Am no professional but enlargement would do but she should first talk to a physician and you shouldn't worry about your breasts there's more to life that just that
