power training is what we called spending greens on one player and give q +1,2,3 or one star (75 sp) with hard training.
3 bars in practice match. In old version it's -18 condition loss.
This can last few minutes. Just for the fast trainer, not a group or the whole team.

Age isn't the most imprtant. A 23 y.o. nordgen can get more gaining than a 0T academy player.
So you can use the old version to understand if the player you got is a fast trainer.
Check this thread for exampes
http://forum.topeleven.com/tutorials...ainers-35.html

After you 'll recognize that your player is a fast trainer, you can use a variety of drills on him.
Depending from his position and the level of the drills you have.