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There is no question that high-intensity interval training (HIIT) can be effective but knowing how to use it correctly is paramount for ensuring clients get results without increasing their risk of injury. ACE Pro Pete McCall explains how to use the ACE Integrated Fitness Training® Model to design effective HIIT workouts for individuals and groups. For more in-depth information on this topic, check out "How to Use the ACE IFT Model to Design Effective HIIT Workouts" in the May 2021 issue of CERTIFIED.