On Thursday, Real Madrid players trained with special facial masks at their base.
A Barcelona fan who sounded somewhat displeased with the club's medical services claims that Barca trainers don't know what this technology is.
"At Barca, the trainers won't even know what this is," @barcaculer18 tweets.
In case you're wondering what this is, we found out that these masks are used to train for physical endurance, as they help simulate high altitude conditions.
Players who use the technology end up improving their respiratory muscles, which helps in endurance during matches.
This season, Real Madrid have suffered less number of injuries, particularly muscular injuries, after hiring fitness guru Antonio Pintus.
Meanwhile, the Blaugrana have seen at least 22 of their first team players suffer from different injuries this season.
