The majority of athletic coaches and personal trainers now carry HIIT in their toolkits. As the name suggests, HIIT alternates short bursts of high-intensity activity with periods of low- to medium-intensity rest. For instance, after a brief warm-up, you might put your all-out, maximum effort into a full-out run for 30 seconds on the treadmill, then decrease to a brisk walk or jog at around 60% effort for one minute, and continue that cycle for 20 minutes. Alternately, you could perform jumping jacks as quickly as you can for 20 seconds, rest for 10 seconds, and then repeat this five … Continue reading The Basics of High-Intensity Interval Training