I agree there is very likely a discrepancy as estimates only go so far yeah, I might go to a gym and try to get some figures there on a trainer.
I know thank you

I just like to get a rough idea even if it's off by a fair bit just gives me a rough figure at least.
Fair enough, I don't know a lot about how muscles work and stuff like that I just thought surely having more muscle would allow the lactic acid to be spread out over a larger area or something and thus increase your ability to respire aerobically for a bit longer at least, but not really sure. Might be worth speaking to a personal trainer to figure out what's best to do