I never worked for Spirit, but I did for a couple of the competitors. Expect to be mistreated by customers, told what to do by managers, have a sore back from the physicality, and be a bit depressed when you grab your check and realize how little you are being paid for all that you do
Seriously, I hope that you get a good manager and coworkers, as that part makes all the difference and can lead to the atmosphere being much more fun