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The popularity of high-intensity interval training (HIIT), which consists primarily of repeated bursts of high-intensity exercise, continues to soar because its effectiveness and efficiency have been proven in use by both elite athletes and general fitness enthusiasts.

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"Is Your Soul Allowing You To Heal?" -- All 7 Recordings in the Series (6 Hours of Audio Clearings)
Martin Buchheit & Paul Laursen – Science and Application of High-Intensity Interval Training: Solutions to the Programming Puzzle