Lauren HollandBy Lauren Holland

Updated November 2026

Ab exercises for lower abs work the muscles below your navel, including the lower fibers of the rectus abdominis and the hip flexors that help pull your legs up. This guide covers six moves, how to perform each one with clean form, and the mistakes that keep most people from feeling much in their lower core. You do not need special equipment to start.

How the Lower Abs Work

The rectus abdominis runs from your ribs to your pubic bone, and it is one continuous muscle, not separate upper and lower sections. What changes the emphasis is the movement: your lower abs work hardest when you bring your pelvis toward your ribcage, a motion called posterior pelvic tilt. Exercises that lift your legs or curl your hips target this action better than standard crunches that mostly lift the shoulders.

Shopping for one? See our guide: 5 Best Ab Exercises Lower Abs: Top Picks Compared (2026).

Hip flexors often take over during leg-raise work. If you feel your thighs or lower back doing most of the effort, reduce the range of motion and focus on flattening your lower back against the floor.

Six Lower Ab Exercises With Form Cues

1. Reverse Crunch

Lie on your back with knees bent at 90 degrees and arms by your sides. Curl your knees toward your chest, lifting your hips a few inches off the floor, then lower with control. Keep your lower back pressed down throughout.

2. Hanging Knee Raise

Hang from a pull-up bar with a relaxed grip. Tuck your pelvis slightly and raise your knees toward your chest until your hips begin to roll. Lower slowly for a count of three. Swinging is a sign you need to slow down.

3. Dead Bug

Lie on your back with arms extended toward the ceiling and knees over hips. Lower one arm overhead and the opposite leg toward the floor, stopping before your back arches. Return to the start and switch sides. Aim for 8 to 10 reps per side.

4. Flutter Kick

Lie flat with hands under your glutes for support. Lift your legs a few inches off the floor and alternate small, straight-leg kicks for 20 to 30 seconds. Keep the movement small enough that your lower back stays on the floor.

5. Lying Leg Raise

Lie flat with legs straight and hands at your sides. Raise your legs to about 90 degrees, then lower them until your heels are just above the floor. Exhale on the way up. If your back lifts, bend your knees slightly.

6. Reverse Plank Hold

Sit with hands behind you, then lift your hips so your body forms a straight line from shoulders to knees. Squeeze your glutes and lower abs and hold for 20 to 30 seconds without letting your hips sag.

Suggested Starting Routine

  1. Warm up with 2 minutes of gentle pelvic tilts and bodyweight marching.
  2. Perform reverse crunches for 3 sets of 10 to 12 reps.
  3. Do dead bugs for 3 sets of 8 to 10 reps per side.
  4. Complete leg raises for 3 sets of 8 to 10 reps, or hanging knee raises if you have a bar.
  5. Finish with a 20 to 30 second reverse plank hold for 2 to 3 rounds.

Train this routine two or three times per week, with at least one rest day between sessions.

Common Mistakes

  • Swinging or using momentum instead of slow, controlled reps.
  • Letting the lower back arch off the floor during leg work.
  • Pulling on the neck during crunches, which strains the cervical spine.
  • Doing hundreds of reps while ignoring progression or form.
  • Expecting spot reduction. Lower ab exercises build strength, but visible definition depends on overall body fat.
  • Doorway or wall-mounted pull-up bar: Makes hanging knee raises possible at home and lets you progress over time. View on Amazon
  • Exercise mat: Cushions your spine during floor work such as dead bugs and reverse crunches. View on Amazon
  • Ankle weights: Add resistance to leg raises and flutter kicks once bodyweight becomes too easy. View on Amazon

FAQ

How often should I train my lower abs?

Two to three sessions per week is a solid target for most people. Allow at least one rest day between sessions so your core can recover.

Can ab exercises for lower abs reduce belly fat?

Exercises strengthen the muscle underneath, but they do not burn fat from one area. Fat loss comes from overall calorie balance and consistent training.

What if leg raises hurt my lower back?

Bend your knees, shorten the range, or switch to reverse crunches. If pain persists, consult a physical therapist or doctor before continuing.

Conclusion

Lower ab work comes down to controlled pelvic movement, a flat lower back, and steady progression. Start with the six moves above, follow the sample routine, and add difficulty as your form stays clean. Consistency over several weeks will do more than chasing high rep counts.

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Lauren Holland

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our core & abs guides, checking product details against manufacturer specifications and owner feedback.