Popsugar Fitness Body Weight 32 No-Equipment Ab Exercises You Can Do on a Mat Heat Up Your Core With 32 Small-Space, On-the-Floor Ab Moves You Can Do Right on Your Mat 31 March, 2020 by Maggie Ryan View On One Page Photo 21 of 32 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 21 Reverse Crunch Lying on your back, lift your legs in the air with your knees bent. Place your hands on the floor beside you. Without momentum, use your lower abs to slowly curl the hips off the floor and into your chest. Slowly lower them back to the starting position. This counts as one rep. Previous Next Start Slideshow Body WeightBodyweight ExercisesCore ExercisesAb ExercisesWorkouts