I can only speak of Army Recruit Course.
As officer entry, you may go to
RMC Duntroon and be mixed with Army, RAAF and RAN, they all train together for 18 months. Or if you're getting a degree with the military, you'll go to
ADFA and be basically a uni student for 3-4 years. That's how it was in the past, though it seems nowadays you might
end up in Sale with just RAAFies for company, and do it in 16 weeks.
So the physical training will likely be less intense - they simply have longer to train you, much longer than the 6 weeks of Army Recruit Course. I say "likely" because I haven't experienced or instructed it.
In Army, the physical training consists of runs in shorts and t-shirt, marches in webbing (the stuff you carry ammo, water etc on) or webbing, rifle and pack (about 35kg gear in all).
Pushups are given as punishments (most do zillions), physical training sessions will have lots of situps, heaves, other stuff like burpees and jumping jacks. Sometimes you do things like log or shell (old artillery shell filled with cement) carries. Swimming stuff goes in and out of fashion.
There are also activities like an obstacle course. It's here you need the upper body strength (thus the pushups and heaves) for pulling yourself with rifle and webbing over walls, up ropes and so on.
There used to be two tests, the Basic Fitness Test and the Combat Fitness Test. These involved things like - a 5km run in under 25'00", a 15km march with full webbing, rifle and pack in under 2h20'00" which was followed by a test of rifle use (not firing, but safe use and pulling it apart and putting it back together), carrying another solider of about your own size 100 metres, a section (6-12 soldiers) co-operating in carrying one of their guys on a stretcher for 1.5km during the 15km march, and so on.
I don't know if they still do these things, however while the details change the general style doesn't. Being able to run a long time, march a long time carrying a lot of shit, and do zillions of pushups, these things never seem to go out of style for the military.
Here the Sale joint tells us about RAAF OTC activities. It sounds like much the same thing as the Army. Notice they give three levels of fitness testing, obviously expecting you to get fitter during the course. On the final one I think they mixed up a column, so the requirements will be,
FAH - 30 - no I don't know what this is
Pushups - 25
Situps feet assisted - 65
2.4km run - 12'00"
5km walk - 38'00" - this would be with webbing, rifle and perhaps pack.
To say much more we'd need to meet in person, I think.