Alexis Sanchez is renowned for his work rate and passion for the game. This story found via Reddit exemplifies that.
“So a family member of mine works for the club (I would rather not answer questions on who he is as I like the anonymity and his position isn’t that interesting) – anyway, just had lunch with him and he told me that Alexis has a small tightness / niggle, very minor but has been told to rest his leg.
“Alexis was found (caught) by staff halfway up a climbing wall with a body pack of weights attached. When told to get down he continued stating that he had to get to the top. Afterwards he told the medical staff that while at Barca he was told he would be out for 12 weeks, he came back in 2. His current “injury” is nothing. Apparently he just can’t stop working out / training.