Yeah that whole thing is a joke. Apparently the coaching staff takes a stat known as a "loaf" during conditioning drills. If you let up early on anything it's a loaf. The first loaf gets you a warning upon the second loaf you get a purple jersey. I think it's a great motivator. I mean who wants to play football in purple... I'm looking at you Minnesota.
These people really have to much free time on their hands and not much else to worry about if this offends them.