Still basking in the glow of his victory with Charles Barkley in The Match 3, Phil Mickelson posted his latest instructional video overnight. Only this time, it had nothing to do with golf.

The five-time Major champ fooled everyone with the old, “The biggest mistake I see among most amateurs” line before getting into some technical mumbo-jumbo about the correct way to utilise the arms and the legs. But his advice wasn’t related to pulling off a flop shot or hitting bombs. Instead, he focused on a move that won’t come in handy until after you’ve already wrapped up your own match: the worm.

Check it out as Lefty provides a tutorial on how to get down. Literally.

Pretty random, but also highly entertaining.

Of course, he’s dating himself with such an old move. But at 50, we also can’t help but be impressed with how limber he is. And yes, those glorious calves.

Anyway, maybe Mickelson was just offering another method to burn off calories. Just be careful if you’re going to try this at home.