If you can measure CSA readily, with great accuracy (relatively), and at low cost (relatively)- how is it hard to figure out? It's really not hard or icky. Literally we could do it for a muscle on you in under an hour. Is that graduate level analysis and does that make it less useful? I suppose that's context specific, right?
I'm sorry you think I'm brushing your argument off due to an educational gap- that's not the case at all. It was just not as complete or as airtight as you might perceive based on certain fundamentals. I've presented them for your consideration and you question my character vs. modifying your argument. That's fine too.
Look, if you want to present a counter argument to the "zumba is not training" opinion that's given here...do it. Biology vs function just isn't the way to go about it and if you did, it'd be prudent to stay away from concepts in ex phys that are well supported and are starkly opposed to your point. I'd be open to other explanations of why strength is purely a functional manifestation of biology and that this somehow supports zumba being training by any standard definition. If you feel I've overlooked a very well thought out response you've already given, please let me know. I think you'll find that your holes have been exploited and the inherent weakness in your original argument has been exposed. Sorry if that comes off like "I know more than you", but I didn't say that.