I read something about this a while ago which might be (or part of) the answer you are looking for - Marciano apperantly loved doing roadwork, even when on vacation he would get up early in the morning, go running and do his training
Arh right I didn't read it, I saw it in this clip: [ame]http://www.youtube.com/watch?v=bVt11BC1WNs[/ame]