Kristin Cavallari is still at the top of her game, in no small part due to going hard in the gym … and her workout routine looks just as sexy as she does.

Check out this video Kristin just shared of her hitting the gym … she’s in dripped out in ALO yoga gear and she’s got her boobs out as she works out.

Kristin is sculpting her lower body here with trainer Stef Armstead … and it looks like she got a workout in before heading out to Laguna Beach with some girlfriends.