Shadow Boxing - Uppercuts
Start with your left foot slightly forward in a regular boxing stance.
(If you're southpaw, start with your right foot forward.)
Start running as fast as you can while simultaneously punching your arms upward into an uppercut motion as fast as you can.
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Krista Stryker is an NSCA certified personal trainer and the founder of 12 Minute Athlete, a popular website and app helping thousands of people get fit in as little time as possible. A HIIT workout regimen consisting of incredibly short, effective workouts based on calisthenics, cross-training and functional fitness, 12 Minute Athlete helps athletes of all level get in the best shape of their lives with minimal equipment and no gym membership.