The minute you decide that you want to join the ADF is the minute you should commence your training.
Don't leave it to the last minute. There is no magic that can be done at that point in time.
In this Quick Chat we discuss the importance of commencing training YESTERDAY so that you're not at a mad panic 2 weeks out from a PFA.
For more notes on this topic head over to this link-
https://www.thebarracksgym.com.au/blog/why-you-should-have-started-your-fitness-training-yesterday