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High-Intensity Interval Training (HIIT) has solidified its place as a cornerstone of the fitness world. Its immense popularity is for good reason: it is incredibly effective at maximizing calorie burn, supercharging cardiovascular health, and building explosive power in record time. At its core, a standard HIIT formula alternates short bursts of all-out, maximum effort with brief windows of recovery. But "HIIT" isn't a one-size-fits-all term. This pattern can be engineered ac