I did read through the Wiki and the Codex but there is no description on how they actually train ? Like do they do calisthenics & yoga ? Or do Sudoku puzzles for mental exercise ? Or do something else. That is what I am wondering.
Use the Force, Luke!
No, wait...
Use your Biotics, Shepard!
-That's better.
But really, it seems the Biotics go to schools or Institutions like the Grissom Academy where they learn how to focus and properly cast biotics.
Or in some cases, like Jack that was implanted and had to adapt, otherwise she would've been tortured even more in the Pragia Facilities.
But in reality, it isn't quite well explained if they have some random outbursts or something like that when they aren't trained.
(Oh, there is Gillian on the Ascension Novel, but since its mainly because of
I wouldn't count on any other biotic person having random outbursts)