OK I can't get anyone to cover for me, I already asked. There's only 3 guys, the rest are all girls. One of the guys is working the same hours as me already, and the other can't cover my shift. Girls can't cover my shift because I do heavy lifting.

I really like this job though, so I'd rather not get fired... If I were to call in sick, what exactly should I say? I've never done that before.