HIIT It Hard
The heart is the most important muscle in the human body. Like any other muscle, it adapts to the workload it is given. Varying the time, distance, or intensity of your workouts keeps your heart working hard. This longer routine will increase your cardiovascular endurance, improve your athletic performance, and build your strength.
TRAINER TIP
TIP HIIT is a maximal heart rate activity, so you get out what you put in. Push yourself mentally as well as physically with this routine—especially at Level 3. How much do you want it?
No rest between rounds.
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