This Is the Best HIIT Workout, According to Science

This Is the Best HIIT Workout, According to Science Any HIIT (high-intensity interval training) session has major fat-burning benefits, but a 4x4 workout is tops for improving fitness.

Original article and pictures take http://news.health.com/2016/02/11/this-is-the-best-hiit-workout-according-to-science/?crlt.pid=camp.9TUq5dlp2MRf site