Increasingly, golfers who want to compete at the highest level need to pay greater attention to their fitness. Joey Diovisavli, or "Joey D" is the trainer to Dustin Johnson, Brooks Koepka, and others, and has been named one of Golf Digest's top golf fitness professionals in the U.S. He joins us to talk about what players are doing when they log so many hours in the gym, and what you can do physically to up your game this year.