I have noticed that by doing the WODs, the proper warm ups, and slowly jogging from the train station a few blocks to and from my classes 5 days a week I am turning back into an endurance monster. I'm not losing any strength at all, I am simply getting to where I don't get tired anymore, like ever.
I was sparring last week for what I guess was a few pretty long rounds, and the other guys (who compete and consider themselves to be in fairly good shape) were like "Dude, are you tired?" I honestly answered no, I mean I wasn't even breathing hard. I told them the mid and rear delts on my left shoulder were tired from so much jabbing since I am not used to that anymore, but that was it. I wasn't really even sweating. Pretty funny. The same thing happens when I was rolling, I just don't get tired.
Not much else to say, I just wanted to share. The WOD programming builds excellent endurance.