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“One of my favorite lower body workouts is a High Intensity Interval Circuit (HIIT) that includes a combination of all-out effort and active rest,” said Kristina Portillo, a certified personal trainer and founder of BusinessTravelLife.com. “The reason that I love the HIIT circuits is that they can be done just about anywhere, including a hotel room or at home. My circuit includes jump roping, different styles of squats and lunges, bench steps ups and bench jumps, and other plyos such as burpees and squat jumps.”