Genetics play a part. Some people's muscles are more or less prone to injury. Sometimes it's lifestyle related also. Players like Cristiano Ronaldo for example were rarely injured in their careers and if you ever look into it he had an absolutely religious diet, recovery and training regime away from his football clubs, whereas some players finish training and may then go slope off, eat c***, play video games or watch TV etc. You are actually at the most prone to muscle injuries where you are sedentary then active. So you just don't know what factors mean that a certain player is plagued by injuries while another doing mostly the same thing isn't.Assuming it's even worse for the full backs.
Porro hasn't been injured, but he's clearly completely done in