Fireheart free HIIT workout by Darebee
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DAREBEE Workout: What it Works
High Intensity Interval Training turns back your biological clock making your body younger at a cellular level. There is a price to pay for youth, of course, and the Fireheart workout makes sure you are paying it. Make sure you get maximum volume in each exercise and do not let up until the last set is done. To live longer you really need to get fitter. 
Extra Credit: 1 minute rest between sets.