the GK training is a glitch, where you put all your players but none except the GK is gaining anything.
But in the next "normal" training for them, they earn all the skill points from previous condition loss (investing the relative greens).
So I 'm saving time from this boring training system.

-Press the play to defenders
-Slalom dribble to MC
-Wing play to attackers.
I give a massive GK training to all of them and one drill to each position players.
That saves me from triple spending time.

* but not less greens