Prehabilitation focuses on identifying your potential strengths and weaknesses and looking at ways to prevent these turning into problems.
As a clinician, it is imperative that I do not medicalise a non-issue.. So I will not just say "you should have insoles for those flat feet" or that you need to buy an expensive pair of trainers because your big toe joint might have a bit of limited movement.
I will work with you to identify your short, medium and long-term goals; discuss factors that may lead to you struggling with your lower limb, and suggest a program of exercises that you can follow to prevent you developing issues.
The most important point is education though. If you understand the way that injuries develop, you are more than half way to having a long and active athletic career, whether you are 18 or 80... I will still treat you so that you are optimised to the level you want to be, rather than a cookie cutter approach that you can download from anywhere online.