Boost Your Metabolism

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You already know that high-intensity interval training (HIIT) is king for revving your metabolism for maximum burn, but picking the right moves is key. Bursts of speed and plyometrics can build strength and power by working your fast-twitch muscle fibers (the ones involved in quick, explosive movements), while dynamic moves like power lunges can push your mental and physical limits. This HIIT workout from Los Angeles-based trainer Sarah Kusch blends all that together, all while building in interval blocks that keep metabolism humming after your workout is finished.

How it works: Grab a set of dumbbells and an exercise mat. Follow along with Sarah for a 5-minute dynamic warm-up, 25-minute HIIT workout (divided into three blocks), and a 5-minute mobility and static stretch cool-down. Do the first HIIT block with 80 percent of your maximum effort, the second at 90 percent, and the third back at 80 percent.

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