Intensity trainer/training x40 youth academy

[Siddharth Singh]

I have the option to appoint an intensity trainer/training x40 to one of the players in my youth academy, which would reward him with a quality of 109 % (+6*). Does that automatically make him a fast trainer next season?

No and there is no way to know which Youth Academy player would be a fast trainer.

I don't think Youth Academy player are fast trainers.

All of the players I have got till now none were fast trainers. Except the one I got at Level 1. One of them was a decent fast trainer but not the fastest.