There are 9 different training routines so if you can afford them, have 9 coaches and assign one only to each of the 9 routines as follows:
1. For the Strength training area, your coach needs high attributes in Fitness
2. For Aerobic, Fitness
3. For Goalkeeping, Coaching GKs
4. For Tactics, Tactics
5. For Ball Control, Technical and Attacking
6. For Defending, Defending and Tactical
7. For Attacking, Attacking and Tactics
8. For Shooting, Technical and Attacking
9. For Set Pieces, Technical and Tactical
This will almost certainly increase the stars in each area and will improve as you get better coaches because you can recruit with specific attributes in mind.
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