Do like a normal resume--if you don't have experience, list your hobbies and interests. How long have you been participating in athetics? Bike riding? Attending their classes? What do you bring that is different? Goals?
Do you cycle? Have you attended other spinning classes? That is the biggest complaint I have about my spinning instructors. They either have never been on a real bike, so they don't know what "gears" are or what they are trying to simulate. OR, they've never been in any other instructors' classes, so they don't know what they are doing the same or different.
Everybody starts somewhere, and the resume is just like filling out an application. I hate applications, so I'd rather leave a resume.
"Well-behaved women seldom make history." --Laurel Thatcher Ulrich
'09 Trek WSD 2.1 with a Brooks B-68 saddle
'11 Trek WSD Madone 5.2 with Brooks B-17