"Aerobics/cardio can also be comparable to the stamina based labor of Neolithic subsistence farmers:"
I agree, except the latter expends energy for labour, whereas the former expends energy for the sake of expending energy, which feels wasteful. For example, I myself dislike going on runs (track/treadmill/etc.) that fulfill no practical travel purpose. Instead, I prefer incorporating running into my grocery shopping (empty backpack outbound, backpack filled with groceries inbound), which achieves a journey that I would have needed to go on anyway. I despise those who exercise in the gym but also drive cars everywhere. If they are willing to expend so much energy, why not expend part of it to drive less? Similarly, I despise even more those who exercise in the gym but also hire domestic help for cleaning the house. Why not clean the house yourself FFS? And so on.