High intensity interval training (HIIT) is, by no means, a new phenomenon in sports and fitness. It has been used by athletes for performance enhancement since 1912. Perhaps the most famous HIIT protocol was done by Izumi Tabata (1996) in which he investigated if a 4-minute HIIT protocol could improve V02max and anaerobic power, which it did. Since Tabata published his research, hundreds of other researchers have completed HIIT studies to investigate the effects on fitness, fat reduction, insulin sensitivity, feelings of energy, reductions in blood pressure, weight loss, V02, anaerobic power, decreases in waist and hip circumference, and the list goes on and on. In regard to using HIIT for fitness clients, this article will investigate the newest, and most exciting, HIIT protocols.
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