All the Girls answer this question

Okay so I'm a 17(M) and there's this girl in my gym she comes with 2 guys.None of the guys are her bf and she prolly knows them since before cmg to the gym and she trains with them prolly cuz the guys have been going to gym before so they hv knowledge abt exercises and all.That girl stares at me a lot and I've caught her doing that and the moment I look at her she looks away and now even I've started to like her too.Idk how to approach her and wt should i say.So girls,lmk of smooth ways I can ask her out