The Arnold Palmer Invitational was a banner weekend for golfer Kevin Kisner. The South Carolina-born golfer finished tied for second in his best finish in over a year on the PGA Tour, and took home $765,600 in winnings.

But for fitness-focused types, the top story out of the Invitational wasn't Kisner's performance—it was Kisner's caddy.

More specifically, it was his caddy's legs.

Some eagle-eyed viewers couldn't help but notice that Kisner's caddy, Duane Bock, has some absolutely massive calves:

But this isn’t the first time that Bock has received attention for his mammoth muscles. During the final round of The 2015 Players Championship, Kisner’s calves got plenty of screen time, leading one fan to create a Twitter profile just for the calves, fittingly titled, ‘@BocksCalves.’

Clearly, Bock never skips a leg day.

Want to give your calves some bulk and add some size to your legs? Try these workouts from Men’s Fitness and get the look you want: