High Intensity Interval Training (or HIIT for short) has been helping people sweat and build muscle since it gained traction years ago. HIIT workouts are quick and dirty, and a great addition to any workout routine, from marathon running to weight lifting. It works well as a finisher to your workouts or as a stand-alone program, especially since you can get it done in no time! 
 
We have packed 11 HIIT workouts- everything you need to know about HIIT right into this handbook