Novak Djokovic has to be feeling pretty good these days. The world No. 2 is 215 points behind Rafael Nadal with nothing to defend in Paris next week or the ATP Finals in London afterward. He's entering the final stretch after putting together a four-title season with wins at Wimbledon, Cincinnati, the US Open and Shanghai.
And so why not share a more fun part of his workout? The Serbian is a master of balance, and flexibility; maybe it's because of obstacle courses like these: