Popsugar Fitness Workouts Cardio Workouts 36 Cardio Workouts to Burn Major Calories at the Gym July 4, 2016 by Leta Shy View On One Page Photo 3 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 Stationary-Bike Workouts Mix up your stationary-bike routine with a fun 35-minute bike workout that mixes up speed without piling on the resistance. Need some more cardio in your life? This 45-minute heart-pumping workout is great when there's a line for the elliptical or treadmill machines. Previous Next Start Slideshow WorkoutsCardio WorkoutsRowing