The short summary: To get to know other squadrons in the wing, 4 degrees are passed around ten squadrons, the staff of another group, and their home squadron, while being "challenged physically" at each station. Essentially, three hours of physical training split up into about ten minute intervals among other squadrons.
Yes, I loved that wording. "Challenged physically", haha. Well, I guess it was true although they could have just said "trained". Honestly, though, parts of it were sort of fun, too.