3. Reverse Crunch to Heel Drop Lie on your back with your legs extended in the air. Rest your hands by your sides, palms facing down. Draw your abs in, pressing your lower back into the floor. Lower your feet to the floor with bent knees, tapping your heels on the floor. In one fluid motion, raise both legs up, lifting the hips off the floor, performing a reverse crunch. This completes one rep. Keep going for 40 seconds, followed by a 10-second rest. Image Source: POPSUGAR Studios NEXT GALLERY This 20-Minute Abs and Glutes Workout Is Just 4 Bodyweight Moves by Jenny Sugar