From what I’ve seen, injuries are rare. And most of the people who post injuries admit to going way beyond the recommended guidelines. Injuries are mostly from high-risk (and supposedly high-reward) practices due to impatience.
I have done some pretty extreme things and have never been injured. I’m not advocating it. I have since renounced those ways and now practice a mild, gradual routine, successfully.
Still, it seems that there are those times when someone stays within the guidelines and gets injured - usually not seriously. And if they would just leave their dicks alone for a couple weeks or months they would recover quickly. But most find it hard to do this and end up prolonging their injury. Also, if you do get injured and are worried about it, go to the doctor - another thing that many people seem afraid to do when they get injured.
There’s always a risk of injury in every physical activity. But if you follow the guidelines posted on this forum you should be fine.
Being scared is better than being overzealous. That way you’ll be cautious.
Also, you don’t have to practise PE. I you’re like most people here when they started (including me), you’re dick is already good the way it is.