http://www.12minuteathlete.com
-Stand straight as you tighten your core and pull your shoulders back.
-Step one leg behind you in a lunge position.
-Step back to standing, then step the opposite leg behind you into a lunge.
-Return to standing. Each leg counts as one rep.
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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.