Old Bare Knuckle Boxing

I've been reading an interesting blog on:

Plug Ugly's Boxing Blog
A discussion of boxing technique and tactics from the old school.
Also articles on adapting boxing to MMA.

http://pluguglysboxingblog.blogspot.com/2011/06/bare-knuckle-boxing-training.html

The writter issues the reader a challenge @ the end:

On a Saturday off and try John L. Sullivan’s workout sometime!
Get up early and start walking for six or seven hours, then run, then swim, then wrestle and then do a boxing workout!
Walking that far in and of itself is deeply exhausting, now go to the gym!