As Beagle said - this was back in the 70s when we somehow managed to fly, and carry out out our other duties without attempting to emulate Olympic athletes. I believe a similar attitude to excessive physical fitness training was prevalent amongst an earlier generation who somehow managed to get through the Battle of Britain without doing anything more strenuous than sprinting 30 yards to their aircraft, and lifting a pint in the local pub at the end of the day.
His story reminded me of a former cavalry officer who by some mischance found himself in the RAF Regiment. He wore the flowing locks favoured by the cavalry, and one day his boss gently suggested it was time for a haircut. Adopting a hurt expression he replied, "But sir, the men have their hair cut, officers wash theirs".