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For fitness enthusiasts who need a little cardio variety, HIIT (or high-intensity interval training) has long been a popular ...
This article was medically reviewed by Joey Thurman, CSCS, CPT, FNS, a Chicago-based fitness expert and creator of Fast Results program. HIIT workouts ... will take about 20 minutes (although ...
Keep scrolling for 21 great high-intensity workout options to try that range from five to 45 minutes and include all different protocols. Note that since HIIT has such a broad definition we used ...