Glenn Cunningham

There is excellent data starting in the 1930s on elite athletes.

A man named Glenn Cunningham ran a 404 mile indoors off about 25 miles a week of training, maybe 30, had a VO2 max in the high 70s.

And if you look at what people have done is in terms of running.

So you take that 30 miles a week he was running and add 70 miles a week of quote over distance or zone two or whatever you want to call it.