Kendall Jenner and Hailey Baldwin hit up West Hollywood workout joint Y7, on Saturday, in their sexiest Spandex, working up a sweat at LA's newest exercise trend, hip-hop yoga.

The girls showed off their abs in sports bras and went makeup-free for the intense, 60-minute class "of intensity combined with heat and strength complemented by deep breathing and a calming of the mind," according to the studio's web site. It reads, "We ask you to step outside the chaos and embrace the fire inside. You’ll flow along to the latest beats. There are no mirrors in the candle-lit studios. The darkness, the sounds, and the heat will take you to a place you’ve never before been."

Somehow we doubt a hip-hop yoga studio's heat can take Kendall and Hailey to a place they've never been before -- these two have dated Harry Styles and Justin Bieber, so we're thinking there's not much sweaty enlightenment that hasn't already burned through their veins ...