MY advise is to avoid stamina training during the regular season. However, when post season begins, you don't always have 3 gamer per week. Even if you do have 3 games per week, playing your trainees out of position to get teh training could hurt your chances of making it to the next round (aka winning the game). Hence, if you need to train Stamina, those are the weeks that i'd advise stamina training. But overall stamina 6 is good enough. 9 is excellent. anything above 9 is a waste imo, so be sure you really need it before starting stamina training.