Any HIIT (high-intensity interval training) session has major fat-burning benefits, but a 4×4 workout is tops for improving fitness. | See more about Hiit Interval Training, HIIT and Interval Training.
Original pictures take http://news.health.com/2016/02/11/this-is-the-best-hiit-workout-according-to-science/?crlt.pid=camp.9TUq5dlp2MRf site
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