PF:
As mentioned above, the best trg you can do for Cranditz is jogging, and walking in boots.
For jogging, expect to be able to do 1.5 miles in 12 mins or under, an 3 miles in around 25-30 mins. On later exercises (dont worry, this will be built up) you will expect to do up to 30 km a day running and walking.
Swimming is also an important facet, and try to work on strength too, so you can help your mates out with heavy stuff...
Finally, the RAF fitness standards are different for girlies, and lower...but then the male standards aren't exactly difficult, so you should have no worries, provided you look after yourself!
Get back to me if you need any more advice!