FITBODY Exercise Library · Core
Bicycle Crunches
If you want a core exercise that targets both your upper and lower abs and strengthens your obliques, the bicycle crunch belongs at the top of your list. This dynamic move mimics a pedaling motion while engaging your entire midsection, which makes it one of the most effective ab exercises for women over 40.
What Is a Bicycle Crunch?
The bicycle crunch is a bodyweight core exercise where you lie on your back, alternate bringing your elbow toward the opposite knee, and extend the other leg out as if pedaling a bicycle. It targets your rectus abdominis at the front of the abs, your obliques along the sides of your waist, your hip flexors, and your lower abs when done correctly. Unlike a standard crunch, the bicycle crunch also engages your twisting core muscles, which makes it especially useful for building definition and strength around your waistline.
How to Do Bicycle Crunches
Keep your lower back pressed into the mat the whole time, and let your abs do the work rather than pulling on your neck. With the women I coach, slowing the pedal down and exhaling on each twist is what really makes the core work. If your lower back starts to arch, slow down or shorten the range until you can keep it flat.
What Muscles Do Bicycle Crunches Work?
Bicycle crunches work the whole midsection, led by the rectus abdominis and the obliques, while the hip flexors and deep core help drive and stabilize the movement. The twist is what makes them so good for the obliques and the waistline. For a closer look at these muscles, see this abdominal anatomy overview. This move fits right into a complete core routine for women.
See the full muscle breakdown
- Rectus abdominis: the front of the abs, both the upper and lower region, which flexes the spine as you crunch up.
- Obliques: the sides of your waist, which the twisting motion targets for definition and rotational strength.
- Hip flexors: help drive the pedaling motion of the legs.
- Deep core stabilizers: work to keep your torso stable and your lower back flat.
Sets and Reps
Match your sets and reps to your level, and prioritize control over speed on every rep.
| Level | Sets | Reps per side |
|---|---|---|
| Beginner | 2 to 3 | 10 to 15 |
| Building endurance | 3 | 15 to 20 |
| Core strength, slow and controlled | 3 to 4 | 12 to 15 |
Rest 30 to 60 seconds between sets. Focus on control and feeling the core work rather than racing through reps. Two to three core sessions a week is plenty.
Common Mistakes to Avoid
- Arching the lower back. Keep your lower back pressed into the mat. If it arches, you risk strain and lose effectiveness.
- Pulling on your neck. Rest your hands behind your head for light support and let your core lift you, rather than yanking your head forward.
- Racing through reps. Go slow enough to feel each twist. Quality beats a high rep count.
- Holding your breath. Exhale each time you twist to deepen the abdominal engagement.
Bicycle Crunches FAQs
Are bicycle crunches effective?
Yes, bicycle crunches are one of the most effective abdominal exercises, because they target several muscle groups at once, especially the obliques and the deep core stabilizers. When done correctly, they help build core strength, improve posture, and support better balance and movement. The American Council on Exercise has even rated the bicycle crunch as one of the most effective ab exercises compared to other common moves. The twisting motion is what sets it apart from a standard crunch. That combination of flexion and rotation is why I include it so often.
What happens if I do 100 bicycle crunches a day?
Doing 100 bicycle crunches a day can strengthen your core muscles over time, especially if your form stays correct, but more reps are not always better. If your goal is visible abs or a flatter stomach, core exercises alone will not reduce belly fat, since you cannot spot reduce fat from one area. A flatter middle comes from a combination of strength training, cardio, and calorie controlled nutrition. That said, 100 good reps a day can build muscular endurance and keep your abs engaged. I would rather see clean, controlled reps than a rushed hundred.
How do I do bicycle crunches as a beginner?
If you are new to this, start with a few simple modifications. Begin with fewer reps, around 10 to 15 per side, and rest between sets. Keep the range of motion small and controlled at first, since you do not have to twist fully right away. Support your head gently with your hands behind it and focus on lifting with your abs. Build up gradually over time rather than rushing through a large number of reps.
Do bicycle crunches give you a flat stomach?
Bicycle crunches can strengthen and define your abdominal muscles, but they do not burn belly fat on their own. A flat stomach comes from a combination of a clean, calorie controlled diet, full body strength training, and regular cardio. Research on abdominal exercise confirms that training the abs alone does not reduce abdominal fat. Think of bicycle crunches as one piece of the puzzle, they build and shape your core, but the muscles only show once you reduce the layer of fat over them. That is why I always pair core work with solid nutrition and full body training.
References
- Vispute, Sachin S., et al. “The Effect of Abdominal Exercise on Abdominal Fat.” Journal of Strength and Conditioning Research, vol. 25, no. 9, 2011, pp. 2559-2564, doi.org/10.1519/JSC.0b013e3181fb4a46.
- Escamilla, Rafael F., et al. “Core Muscle Activation During Swiss Ball and Traditional Abdominal Exercises.” Journal of Orthopaedic and Sports Physical Therapy, vol. 40, no. 5, 2010, pp. 265-276, doi.org/10.2519/jospt.2010.3073.
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I’m Julie Lohre, an IFBB Fitness Pro and certified personal trainer and nutrition specialist. For more than 20 years I have helped women over 40 get stronger, leaner, and more confident through personalized online coaching built around their real lives.