How to ask the girl who works at my gym out?

[Curious J]

Hi so there is a girl who works at the gym i go to and i am generally shy not a creepy shy but not really good at starting a conversation i would like to ask her out i have talked to her for maybe 5 minutes but i wouldnt think it a conversation she would remember she liked the shirt i had on but i could use some help thinking of a conversation to break the ice some advice would be appreciated thank you for any help i sadly didnt even catch her name honestly that short