Join celebrity trainer and wellness coach Jenna Willis [1] as she takes you through an amazing 15-minute HIIT workout with her real-life BFF, actress and producer Liza Koshy [2]. These two will keep you on your toes (sometimes literally) as they demonstrate variations on squat pulses, curtsy lunges, push-ups, and Koshy's favorite: Pilates abs. This workout is only 15 minutes, but you're going to get an amazing HIIT workout with a bonus ab section to really burn out that core! All you need is a mat.

Don't miss new episodes of Class Fitsugar, now every Sunday on the POPSUGAR Fitness YouTube channel [3].

Willis's outfit: Old Navy [4] // Shoes: APL [5]

Koshy's outfit: Clique [6] // Shoes: APL [7]