I always was thinking that the injuries have nothing to do with training intensity. The game engine would injure your players no matter what to make you spend some tokens or red boosters. And if you don't spend your money your players will stay healthy even if you train them to the ground.
Last season I spent a few bucks for tokens and had like 13 injuries in 3 days. My players were in good shape and I didn't train them except regular stretching, but they kept getting injured. I thought that Nordeus just wanted make me to spend some more money at the time. This season I'm almost out of tokens and quitting the game, I haven't spent a penny on the game, so I decided to check out how much injuries I'd get training players to zero condition. And got ZERO injuries:
Attachment 15876
Some of those players where injured twice last season. I can't injure any of them this season.
I have a league game in a couple hours. This squad will play at 0 condition and with illegal formation without defense. Wandering how would they do.