Reverse Crunches Steps:
Step 1: Lie face-up on a mat or other soft surface with your knees bent at 90 degrees and your feet flat on the floor. Keep your arms near your sides with your palms down.
Step 2: Exhale and brace your core. Lift your feet off the ground and raise your thighs until they’re vertical. Keep your knees bent at 90 degrees throughout the movement.
Step 3: Tuck your knees toward your face as far as you can comfortably go without lifting your mid-back from the mat. Your hips and lower back should lift off the ground.
Step 4: Hold for a moment and slowly lower your feet back toward the floor until they reach the ground.
Step 5: Repeat for at least 10-12 repetitions. Do one set to start, and increase the number of reps and sets as you get stronger.