I recall that the fitness test was first brought in to get rid of some of the tubby SNCO's/WO's.
If they failed a couple of times they had to see a doc.
However, they moaned. So aircrew had to take yet another test each year - threatened with having to see a doc. DHO!
The former thing did work though. A lot of shiny-bummed individuals did disappear.
One found it strange though that the Wg Cdrs and above - our leaders = were exempt.
That sodding beep test did knacker a lot of knees during the 180 turn.