The closest I've seen is one that is more for wrestling (competitive and NSFW adult) but it does have fbbs and similar athletic ladies posing, working out and yes wrestling. There's some YouTube stuff in here too - returns more vids of the kind you select than a similar search on YouTube and I think on the better adult sites too (for those of us who like "erotic muscle"). Again this is more for wrestling (mostly female and some gay men) than female muscle though:
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