How to ask an employee for her number?

There is a girl who works at the front desk of my local gym. She is literally the image of my ideal girlfriend and she seems to have a really nice personality too. She gives me a big smile and acts really friendly to me (however that may just be her doing her job well). Nevertheless, what would be the best way to ask for her number? I'm not great at this kind of thing which is why I ask, and there are multiple employees working at the desk which makes it a bit awkward.

Girls that work in gyms are usually friendly and adorable and it’s unlikely they are kicking their heels waiting to be asked for their number. More likely they view it as an occupational hazard. It’s also uncomfortable if you get rejected and you might have to change gym. So I’d try some flirting first - smiling, using name, humour, complements - and only if you get enthusiastic response suggest meeting for a coffee.