That British breaststroke swimmer. OK. So, his training regime is 10 km a day. Before the weights and all the rest of it.
Which is an interesting example of quite how much effort goes into that sporting excellence.
I’m a good swimmer. Just one of those things. I can do a mile, easily – when pools are open and that’s my exercise gig that’s what I generally do as well. I know I can do two miles because I have done.
Could I do 5 and more miles in a day? Sure, spreading it over several sessions, slowly. And having gone into training in order to be able to do it the once.
That is, even as someone with an aptitude for the base activity, I’d have to go into training to be able to do, the once, his normal daily training.
A useful guide to how far away from normality this world beating stuff actually is.