20-miles on a treadmill? We'd pull our hair out. Aren't there places in London where he could run? Why would he do it on a treadmill.
http://www.athleticsweekly.com/featured/charlie-grice-we-call-him-mad-mo-48143#e23zZigppxtIx3zS.99
"“This morning he was doing 20 miles on the treadmill, people don’t see that side of it,†he adds, with ‘this morning’ being the morning after Farah’s world-leading 5000m win at the Anniversary Games. “He never gets too far ahead of himself. He is very level-headed and is working incredibly hard so he deserves everything he gets.
“He is definitely passing on some good knowledge but it is more me seeing what he does, seeing how tired he gets and yet he still gets the work done. I think that is one of the main things I’ve learnt.