Hello Maggie Barclay,
The ACE Group Fitness Instructor Manual says, “Sufficient space for each participant to move comfortably as appropriate to the needs of the specific class.”
I would estimate the person’s height plus three feet for body exercises alone.
Jump roping needs the space of the person holding their rope folded in half in one hand, and spin around.
Each class will obviously be different.
I hope this helps you.