Hey guys - I think this is the right place for this

I have a little problem......
On the Formation Settings screen (where you pick your team etc.) I'm having problems with the coloured arrows that you ca see after pressing R1 (or maybe R2) a few times.
Here is a typical conversation before every Master League game.
Friend: Ah, Zidane is on a blue*, but Totti can come in because he is buzzing**
Me: What about Ronaldo?
Friend: He is on a green and will play, although Kilnsmann is buzzing and could come on
*=a blue arrow next to his name means he will be sluggish, his passing and shooting will be sub-standard and overall he will be bobbins. Anyone on a blue will not start the game.
**=if the players arrow is red then he will almost always start. They will play very well.
So we understand what they mean, but we dont have a clue how to dictate the colour. Playing game after game (and getting a great match rating) doesnt help this at all. We have noticed some patterns, but nothing to really go on.
Another thing........
The green bar is physical condition. We know this. But the thin bar underneath this is causing us some problems too. Is it a teamwork bar? Ive seen it about 10% up and a few occasions but never more. How do I sort this out aswell?
Any help would be very much appreciated. Sorry fr the length of the post, it just needed explaining
Thanks. Ian