REVERSE CRUNCH
Lower Ab Isolation Exercise
Primary Muscles
Exercise Description
The reverse crunch targets the lower portion of the rectus abdominis by lifting the hips off the ground instead of the shoulders. This makes it excellent for building lower ab strength and definition.
How To Perform
Lie flat on your back with arms at your sides, palms facing down.
Bend your knees to 90 degrees and lift feet off the ground so thighs are perpendicular to the floor.
Engage your core and curl your hips off the floor, bringing knees toward your chest.
Squeeze your lower abs at the top of the movement.
Lower your hips back down with control, stopping just before they touch the ground.
Repeat for the desired number of reps, maintaining constant tension.
Expert Tips
Focus on hip curl - Think about curling your pelvis toward your ribcage, not just pulling knees to chest.
Control the descent - The eccentric phase is crucial. Lower slowly for 2-3 seconds.
Don't use momentum - No swinging or kicking. Use controlled movements powered by your abs.
Keep lower back down - Press your lower back into the floor throughout the movement.
Common Mistakes
Using leg momentum - Swinging legs reduces ab engagement. Control the movement with your core.
Incomplete range - Curl hips all the way up. Partial reps reduce effectiveness.
Neck strain - Keep head relaxed on the floor. Don't pull on your neck.
Moving too fast - Slow, controlled reps build more core strength than fast reps.
Video Guide – Reverse Crunch
The reverse crunch is one of the most effective exercises for targeting the lower portion of your rectus abdominis. While regular crunches lift your shoulders toward your hips, reverse crunches do the opposite—curling your hips toward your shoulders. This movement pattern specifically emphasizes the lower abs, an area many people struggle to develop. The beauty of reverse crunches is their accessibility—you need nothing but your body and the floor, yet they provide serious core strengthening stimulus.
What makes this exercise particularly valuable is how it addresses a common weakness. Most ab training focuses on the upper portion through crunches and sit-ups, leaving the lower abs undertrained. Reverse crunches correct this imbalance by specifically targeting lower ab fibers through hip flexion and pelvic curling. This not only improves aesthetics but also enhances functional core strength for activities requiring hip control and pelvic stability.
Watch the demonstration video carefully. Notice how the movement comes from curling the pelvis upward, not just pulling the knees to the chest. The hips actually lift off the ground as the lower abs contract. The descent is slow and controlled—no dropping or using momentum. Throughout the movement, the lower back stays pressed to the floor, and the upper body remains relaxed. This controlled, deliberate motion is what builds lower ab strength.
Program reverse crunches 2-3 times per week as part of your core training. Perform 3 sets of 15-20 reps, focusing on quality contractions rather than speed or quantity. They work excellently as part of an ab circuit or as standalone sets. Progress by increasing reps, adding a longer pause at the top, or eventually adding ankle weights. For a complete core routine, combine reverse crunches with regular crunches and planks to target your abs from every angle.
Equipment Required
Exercise mat (optional for comfort)