Popsugar Fitness Bodyweight Exercises At-Home Exercises | 15-Minute Cardio Bodyweight Workout Cardio and Strength Training Join Forces in This Intense 15-Minute Bodyweight Workout 30 June, 2020 by Jenny Sugar View On One Page Photo 5 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 High Knees Run in place while lifting your knees high to the level of your waist. Engage your abs as the knee comes up. Pump your arms to warm up your upper body. Do 40 seconds of high knees followed by a 20-second rest. Click here for more workout tips, features, and interviews. Previous Next Start Slideshow Bodyweight Exercises15-Minute WorkoutsIntermediate Workouts