What Is High-Intensity Interval Training (HIIT)?

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* Don’t Do Too Many Sets

Aim for between two and three sets, and achieve failure on each set.

Don’t Do More Than 9 Reps Per Set

And don’t cheat or use shitty form. If your form breaks, call it quits. Using a rest-pause method — where you put the weight down, rest for a few seconds, and then pick it up and finish the set — is a great way to get everything done.