80's exercise: are those regular pantyhose, or special tights?

in the 1980's all the exercise ladies wore leotards and hosiery, were those just regular sheer to waist hose? or were they a special exercise tights? I would like answers from ladies that lived in the 80's and wore them. As a young woman, i wish i was old enough to exercise when this was they fashion, I will bet it felt great to exercise in an outfit like that. also, can you still buy these type of hose today? Thanks for any help!