Target Your Core and Arm Muscles With This 30-Minute Hardest HIIT Routine

Looking for a challenge? This full-body HIIT session is perfect for you. Join celebrity trainer and wellness coach Jenna Willis as she leads you through a 30-minute high-intensity cardio and strength workout alongside class members Paris Nicole and Taylor Ashlynn. Willis keeps the intensity high with a series of jumping jacks, planks, lunges, and more, but you can level it up even more by grabbing an optional pair of dumbbells.

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

Willis's outfit: Alo Yoga; shoes: APL. Nicole's outfit: Old Navy; shoes: APL. Ashlynn's outfit: Stance; shoes: APL