Are you a 100% sure about it??? I thought all skills are increasable equally, and that the game simply highlights those at which the player already has high levels in. Isn't that so?
So one of my strikers (he is 33) has highlighted Positioning and Heading (Why is that in Defense if he's a striker?), and Passing, Dribbling, Crossing and Finishing in Attack, with Strength and Speed and Creativity in Physical & Mental. Does that mean I should combine a defense/attack/fitness mix of workouts that focuses on all those traits? I can't understand why his Positioning and Heading are defense attributes if he's a striker.