On his website Stew Smith talk's a little about Muscle endurance! From what I understand his trianing tends to be geared toward aceing military fitness test. I've read some of his stuff and I am a long way from being able to follow it. In case your wondering he say's Powerlifting/Football type trianing is counter prductive to the kind of endurance you need in the Military.
I find some intresting reading on his site but I don't trian!