Popsugar Health & Fitness Dumbbell Exercises Bodyweight and Dumbbell Exercises The Ultimate Home Workout Guide to the 150 Best Moves Plus 30-Minute Workout Videos 10 April 2020 by Jenny Sugar View On One Page Photo 126 of 165 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 126 Runner's Crunch Lying flat on your back, rest your elbows at a 90-degree angle on the floor. Keep your legs extended out in front of you. With your core engaged, roll up by bringing your shoulders off the ground, followed by each vertebra until your lower back is off the floor. At the top of your roll-up, bring your right knee up to meet your left elbow. With control, as you straighten your leg, slowly peel your back down, vertebra by vertebra, until your shoulders are the last to touch the floor. Alternate with your other leg to complete one rep. Previous Next Start Slideshow Dumbbell ExercisesBodyweight ExerciesDumbbell WorkoutsBodyweight ExercisesHome WorkoutsBodyweight Workouts30-Minute WorkoutsStrength TrainingWorkouts