CRUSHES AND GYM

So I go to the gym during week days and I always see this good looking guy. He always stares at me and I have even overheard him say “look at that hot girl”. He seems a bit shy though and have been noticing him over the last month. I feel like he is older than me by at least 5-7 years. I feel intimidated by him and don’t know what to do. It also makes me a bit uncomfortable. What should I do?

Do I ignore him?

Do I tell him to stop staring at me?

Should I start a convo?

BTW I don’t wear “slutty clothes” to the gym just leggings and using a mild fitting t shirt ( do have big bum and boobs)