Our gym classes were sometimes co-ed, sometimes single sex. They intermingled us when skill sets wouldn’t mean the girls couldn’t do much participating, e.g. indoor soccer, swimming, cross country skiing, but separated us for things like basketball, and for more gender specific things like softball/baseball, gymnastics, & self-defense. Some things we would do ‘together’ like tennis, but the girls always played against girls and boys against boys. What was awesome about our gym classes in junior/senior year was every five weeks was a different ‘unit’ and you could pick which unit you wanted to do. So there might be a choice between indoor soccer, gymnastics, and weight lifting. Next unit the choices might be basketball, swimming, and archery. Yes we had an archery range in the basement, it was awesome.