Sweating it out on the rowing machine is a great cardio workout, and unlike the treadmill, it's usually sitting empty so you can hop on and get working at any time. Added bonus: the rowing machine also works the upper back, arms, legs, and, yes, even core. And while it may seem like an obvious movement, there's definitely some technique involved. Watch as endurance athlete Josh Crosby from Equinoxteaches us how to master the stroke and shares his tips for maximizing this workout. Subscribe to POPSUGAR Fitness! www.youtube.com/subscription_center?add_user=popsugartvfit Visit our website for more great workouts and fitness tips! www.fitsugar.com Are we friends yet? Join us on Facebook! www.facebook.com/POPSUGARFitness Get the latest updates via Twitter! twitter.com/#!/POPSUGARFitness