I'm going to be joining a track club?

well it kind of depends on the weather. if its warm out, i'd wear like soffe shorts or like underarmor and a loose fitting t-shirt. also wear spandex shorts underneath if you have them. if its reallly hot out then you can wear like an exercise tank or cami with shorts. if its cold, i'd still wear shorts, unless its absolutely freezing. just while running anyway. and i'd wear like a loose long sleeved tee shirt with a hoodie on top, you can always take the hoodie off. hope i helped! (: