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https://vo2maxpro.com/blog/does-caffeine-improve-vo2-max

They list a study and more info on that page. Probably why almost all pre-workouts include caffeine. Some push for 300mg per serving.

Yohimbe gives some weird heart effects also.

That doesn’t seem a lot to me at all, and coffee seems to have health benefits up to doses exceeding that.

https://pmc.ncbi.nlm.nih.gov/articles/PMC12348139/

yeah that's a ridiculous amount. I'd be so jittery there's no way I'd be able to workout after taking that much. If I have more than one cup of coffee in a single sitting I get so anxious I can't even take proper deep breaths.

Seven for my ~140kg arse. Not sure how healthily this scales.

That sounds like some weak coffee. Espresso is about 150mg for a double shot I thought?

4 cups of coffee is considered a lot?