Semir Osmanagic is selling his "Quack Mountain" as the cure for diabetes, cancer, ha, ha!
Djokovic is adding to it that players should "come here to take advantage of healthy oxygen levels".
Well, I prefer to stay in the mountains at my backyard (much cheaper rather than travelling to Bosnia) everyone who has a bit of expertise (doctors, clinical researchers, atmospheric physicists) tell me both claims are BS.
I'm expecting Rolland Garros crowd, when they learn about this latest claim by the #1 player, start booing him on the court a little more.