Mrs. Digger found this one. We're wondering what people who know more about the physiology of exercise think of it. The guy writes really well and makes a convincing case, but he's also up front about his amateur status.
http://www.shovelglove.com/
("So I hit myself..." is the site author's forum post about a little whoopsie he had while "shovelgloving.")
http://www.shovelglove.com/
("So I hit myself..." is the site author's forum post about a little whoopsie he had while "shovelgloving.")