Far as I know, just an extension of what would have been done at school, with push ups, running, running on the spot etc etc. Most RAF stations had a gym of sorts, with various equipment, and from what I can gather, it was up to the individual to partake of this, and, of course, when time allowed, games such as football, rugby, cricket etc.
There were, however, regular drills for parachute exits, ditching and dinghy drill, some of the latter on the station, or at a local swimming pool.