If you do HIIT for just three days, you’ll find it’s much easier to make it part of your regular lifestyle. Kill Day 2 with everything you got!
Level 1: If you are having trouble getting started with HIIT, challenge yourself to three days of workout.
Level 2 and 3: If you are already at a high level of fitness and want to shake up your normal routine, this is a fun, energetic way to infuse some intensity into your workout.
Put your cardio endurance to the test with this routine that goes from high-energy cardio to explosive strength exercises. Remember: Train insane or remain the same! No rest between rounds.