PT is a session run for the whole unit. After that, you train on your own. Nobody builds the plan your body actually needs, to stay ahead of injury or to get out of one. When something goes, rehab sits with one person and training with another, on plans that do not talk to each other. You get a sheet of exercises and a date to come back.
Fail to plan, plan to fail. Every soldier knows it. Almost nobody applies it to their own body.
The body that got you through selection is now the thing holding you back, and nobody around you is allowed to say that out loud. Somebody has called you a biff, or said it about a bloke who was actually injured. The fitness, the rank opportunities and the identity you built start slipping at the same time. The fear was never the injury. It's becoming someone the system stops counting.
The downgrade is not what stops the promotion. The year of missed courses, missed tests and no tour on your record is what stops it.
Be the best is the standard for every part of service, except the day you get hurt. Then it becomes rest it, manage it, you're probably just getting older.