The first week of level 2 prepares you for high intensity interval training (HIIT). 

HIIT workouts are based upon short bursts of very intense activity, alternating with periods of less strenuous activity or complete rest. For example, you could sprint at maximum speed for thirty seconds, followed by a walk for one minute, repeating this sequence for ten minutes for a short but very effective fat-fighting workout.

This style has many benefits including a whole body functional approach rather than muscle isolation. It causes your body to increase mitochondrial activity within your cells which transforms your body into a lean muscle creating, fat-for-fuel burning machine! 

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