Ok, back to the subject. As many other questions of the game, there are more than one correct answers.
When I 'm playing hardcore/to the limit/getting 101% of the game (not this period ), I 'm trying not to waste a condition of 104-5% , so I set a normal training in stretching or cardio. But you must be prepare to spend 15 reds if an injury occur.
I played a lot of games, starting with a 85-90% instead of wasting condition or spending some extra greens (but not critical games).
Another thing is the "rest all" button in training section.
It's not worthy as like giving greens individual, but it's a useful tool to synchronize the condition of your team with the game time.
Also useful as emergency button if you log-in, 4-5 min' before the match and the condition of the team is low
Happened to me some times.