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You probably already know about hanging knee raises. You've probably been doing them at the end of your workout as a quick ab finisher for years. But if you only think of them as just an ab exercise, you're underestimating how beneficial this move actually can be.
Here's what's actually happening when you do them correctly and consistently, plus how to get significantly more out of the movement you're already familiar with.
What Muscles Do Hanging Leg Raises Work?
Most people think hanging knee raises are just an ab exercise. But when done correctly, it actives more than just your abs.
Main muscles worked:
- Abs (rectus abdominis) — engaged throughout the entire movement
- Hip flexors (iliopsoas) — these drive your knees up toward your chest
Secondary muscles worked:
- Obliques — prevent your body from rotating while you hang
- Deep core (transverse abdominis) — acts like an internal weight belt, stabilizing your spine throughout the movement
- Forearms and grip — working the entire time you're hanging on the bar
- Lats — keeping your upper body controlled and preventing swinging
- Shoulders — supporting your lats to keep everything stable
One other cool thing this exercise helps build is the ability to create and hold tension while your body is moving under load. That's a skill that directly impacts your compound lifts, your athletic performance, and how your body functions day to day (and it's not something you can get just by doing crunches)
Bar vs. Captain's Chair: Which Should You Use?
The pull-up bar is the more demanding option. With nothing supporting your upper body, your grip, lats, and shoulders all have to work to keep you stable. If you don't hang often, grip fatigue can cut your set short before your core has done enough work.
The captain's chair keeps your forearms and back supported, which removes a majority of the grip and stability challenge. That means more of your energy goes directly into the core movement. It's not easier in a bad way! The captain's chair is great for isolating the ab work, or for doing more reps when your grip is already maxed out from a pull-focused workout.
"So, which should I use?" Use both! They complement each other well, and rotating between them hits the movement from different angles.
Where Most People's Form Breaks Down
You may have solid form already. But two technique points even experienced gym-goers consistently miss, and fixing them makes this exercise noticeably harder (in the right way.)
The Hip Tilt Is Everything
Simply lifting your knees to your chest is not enough. At the top of the movement, your pelvis needs to tilt posteriorly (think of it as curling your hips up and slightly toward you, not just raising your knees). Without that tilt, your hip flexors are doing more of the work, and your abs are less engaged.
The Lowering Phase Is Half the Exercise
The eccentric (lowering slowly against gravity) is where a significant portion of the core work happens. Fight gravity on the way down instead of just letting your legs drop. Three to four seconds on the way down is a simple way to immediately increase the difficulty without changing anything else.
Full Technique Breakdown
1. Set up with intention. On the bar: overhand grip slightly wider than shoulder-width, arms fully extended, shoulders active and engaged. On the captain's chair: forearms on the pads, back lightly pressed against the support.
2. Brace before you move. Before your knees go anywhere, engage your core and draw your ribcage down slightly. (If you skip this, your lower back will engage to compensate instead!)
3. Drive your knees up with control. Exhale as you pull your knees toward your chest.
4. Hold at the top. Even a one-second pause makes a difference! This is where your core is working hardest. Don't skip it!
5. Lower slowly. Inhale on the way down. Resist gravity rather than dropping your legs.
Common Mistakes to Clean Up
Swinging — If momentum is doing the work, your core isn't. Slow down or reduce your reps until you can control the movement fully.
Skipping the hip tilt — Knees to chest without posterior pelvic tilt means your hip flexors are carrying the set. Focus on curling your hips up at the top.
Dropping your legs — Fight the descent every single rep. It's where a lot of the value lives.
Chasing reps over quality — Twelve controlled reps with a proper hip tilt and slow lower will always beat twenty sloppy ones every time.
How to Progress From Here
If you've been doing basic hanging knee raises for a while, and they're starting to feel too easy, here are some ways to progress:
| Progression | What Changes |
|---|---|
| Slow tempo sets | 3–4 second lowering phase — easiest way to immediately increase difficulty |
| Straight leg raises | Legs extended, raising to hip height or above — more hip flexor and core demand |
| L-sit holds | Legs parallel to the floor, held for time — intense core stability work |
| Toes to bar | Full range, feet all the way to the bar — the advanced standard |
| Weighted knee raises | Light dumbbell held between your feet for added resistance |
The Bottom Line
You already have the exercise in your toolbox. The difference between using it as a throwaway finisher and using it as a genuinely effective movement comes down to three things: take the swing out, nail the hip tilt, and control the lowering phase.
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