Phil Mickelson's calves are a huge deal, literally.
The golfer recently went viral when he posted a photo to his Twitter account and fans just couldn't get enough of those massive calf muscles.
Mickelson, being the nice guy he is, decided to share his secrets with the world and show just how his calves got to be the size that they are. Your calves will surely burn if you try this.
Let this be a lesson to never skip leg day.