Fit, Fast and Functional

Fit, Fast and Functional is Genfit's version of a HIIT workout session involves you doing intervals of exercise that range from between 10 seconds and eight minutes in duration, with you working at around 80-90% of your maximum heart rate for that period of time.  

If you don’t have a heart rate monitor (and not many of us do), then you can use a mental scale of 1-10 to measure your effort level instead, with one being sat on the sofa relaxing and 10 feeling like you can’t do any more. For an effective HIIT session, you’ll need to aim for an effort level of around nine out of 10.  By the time the interval is ending you should feel like you couldn’t have continued any longer at that pace.