4 HIIT workouts to try now So you want to be one of those super-fit (and perky) people? Set a goal and time frame and train using these HIIT workouts.High-intensity interval training (HIIT) involves alternating short periods of intense anaerobic exercise with active recovery sessions. These short, intense workouts burn high levels of calories and improve athletic capacity.How: Try the following routine over two to four weeks and complete two times per week.
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