ProgreviaReverse crunch: proper form, muscles worked and common mistakes
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How to do it
Lying down, bring the knees toward the chest by curling the pelvis and lifting the hips off the floor with the abs, not leg momentum. Lower under control without arching the lower back.
Muscles worked
Main muscle: abs. When it plans weekly volume, every set of this exercise counts in full for abs: the generator does not split it with other muscles.
Reverse crunch versus bicycle crunch: moving the pelvis instead of twisting
In the reverse crunch the knees come up and the pelvis curls toward the ribs while your shoulders and upper back rest on the floor. It is the opposite of the bicycle crunch, where the torso rotates and flexes and the legs come and go. There is no twist here: the work concentrates on the rectus abdominis and on your ability to tilt the pelvis backward. It is also the floor-bound cousin of the Hanging leg raise, with the advantage that the ground supports you and your grip is not involved.
You will appreciate it if you cannot hang from a bar yet, if you need something simple to do at home, or if you want to feel the lower abs without the hip flexors taking all the credit. If your lower back arches on the way down, shorten the range and lower your legs less. If discomfort does not settle, it is worth having it checked.
To make it harder, slow the lowering first, then straighten the legs to lengthen the lever, and later try a sloped surface or move to the hanging version. Remember that the pelvis is what rises: a few inches is plenty, and your feet do not need to reach the ceiling.
Technical sheet
- Movement pattern
- Core
- Minimum level
- Beginner
- Technical demand
- Basic
- Fatigue it generates
- Low (0.3 out of 2.2)
- Risk if technique breaks down
- Low
These are the values the generator uses to decide where the exercise goes within the session.
Recommended sets and reps
As an isolation exercise, it works best in 3–4 sets of 10–15 reps with 0–2 RIR. Use it at the end of the session to add volume without systemic fatigue.
Common mistakes to avoid
- Swinging your legs with momentum instead of curling your pelvis up with your abs.
- Sticking with the same version once you can do more than 20 reps: move to a harder variation or add load.
- Doing reps too fast, without controlling the eccentric (lowering) phase.
What the research says
This is an isolation exercise. For beginners, adding it on top of compound lifts does not always help: in the trial by Gentil and colleagues (2013), people who only did lat pulldowns gained as much arm size as those who also did curls. It earns its place with experience, and for muscles the big lifts leave short.
You do not need to reach failure on every set: according to the meta-analysis by Refalo and colleagues (2023), stopping one or two reps short gives very similar growth. The generator prescribes it with RIR for that reason.
- Gentil P, Soares SR, Pereira MC, et al. Effect of adding single-joint exercises to a multi-joint exercise resistance-training program on strength and hypertrophy in untrained subjects. Applied Physiology, Nutrition, and Metabolism. 2013;38(3):341-344.
- Refalo MC, Helms ER, Trexler ET, Hamilton DL, Fyfe JJ. Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine. 2023;53(3):649-665.
How Reverse crunch compares with other abs exercises
Of the 14 abs exercises in the catalogue, ranked from least to most fatiguing by the values the generator uses, Reverse crunch is number 1 (tied with one other).
That makes it a good candidate for adding abs sets at the end of a session or in heavy weeks, when you want volume without extra fatigue.
With different equipment, the same movement pattern offers 3 alternatives, such as Cable crunch, Pallof press and Landmine rotation.
| Exercise | Equipment | Fatigue | Technique |
|---|---|---|---|
| Reverse crunch | bodyweight | Low (0.3 out of 2.2) | Basic |
| Dead bug | bodyweight | Low (0.3 out of 2.2) | Basic |
| Bicycle crunch | bodyweight | Low (0.4 out of 2.2) | Basic |
| Cable crunch | cable | Low (0.4 out of 2.2) | Basic |
| Pallof press | cable | Low (0.4 out of 2.2) | Needs coaching |
| Plank | bodyweight | Low (0.4 out of 2.2) | Basic |
| Side plank | bodyweight | Low (0.4 out of 2.2) | Basic |
| Hollow hold | bodyweight | Low (0.5 out of 2.2) | Needs coaching |
Bodyweight. In the trial by Kotarsky et al. (2018), four weeks of progressively harder push-ups significantly improved bench press 1RM, just like training the bench press itself. It is a strength result, not a hypertrophy one, and the condition is the word progressive: the exercise has to keep getting harder.
An isolation exercise. In the trial by Gentil et al. (2015), with untrained young men over ten weeks, the biceps curl and the lat pulldown were equally effective for gaining strength and size in the elbow flexors: isolation is not filler.
- Kotarsky CJ, Christensen BK, Miller JS, Hackney KJ. Effect of progressive calisthenic push-up training on muscle strength and thickness. Journal of Strength and Conditioning Research. 2018;32(3):651-659.
- Gentil P, Soares S, Bottaro M. Single vs. multi-joint resistance exercises: effects on muscle strength and hypertrophy. Asian Journal of Sports Medicine. 2015;6(2):e24057.
Related guide
How to get visible abs: the truth about the six-pack
Alternative exercises
More core exercises
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Frequently asked questions
What muscles does Reverse crunch work?
Reverse crunch mainly works the abs muscle group, plus synergist and stabilizer muscles depending on the variation.
How many sets of Reverse crunch should I do?
Between 3 and 5 sets per session, adjusting the total weekly volume for abs to your level (about 10–20 sets per muscle per week).
Why do my legs seem to do most of the work in the reverse crunch?
It usually happens when you swing up with momentum or only bend at the hips. Try lowering more slowly, think about peeling your hips off the floor rather than lifting your feet, and shorten the range if your lower back arches. If you still do not feel your abs, switch to an easier variation.
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