Popsugar Health & Fitness Gym Culture 20-Minute, No-Equipment Circuit Workout This 20-Minute, No-Equipment Circuit Is Clutch When the Gym Is Just Too Crowded 24 October 2018 by Colleen Travers View On One Page Photo 3 of 8 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 High Knees Stand tall with your core activated and run in place, driving your knees up as high as possible and landing on the balls of your feet. Previous Next Start Slideshow Gym Culture20-Minute WorkoutsCardio WorkoutsStrength TrainingWorkouts