Penthouse: All Pet Workout (1993)

Six Penthouse Pets decide to get fit (although they look pretty fit to me already, eh, lads? Eh? Eh?), and so put themselves through a nude workout. Eminently sensible of them. I mean, you don't want dangerous things like leotards and sweatbands getting in the way when you're doing a bench-press, do you? Far better to just let it all hang out. And wobble around a lot.