Forget sit-ups — this ab exercise targets your deepest core muscles
When it comes to working on your core, not all ab exercises are created equal. One that does get you a lot of bang for your buck, however, is the reverse crunch, which is far better than traditional crunches, or sit-ups, at targeting all of the abdominal muscles.
Your abs are made up of three major muscle groups — the rectus abdominis, which are the abdominal muscles that run down the front of the stomach, and are the ones that are visible in a ‘six-pack’. The transverse abdominis, which are the deepest abdominal muscles, and the obliques, which run along the side of the torso. Unlike traditional crunches, reverse crunches target the rectus abdominis and the transverse abdominis.
A study published in the American Council on Exercise found that traditional crunches are one of the least effective abdominal exercises you can do. When you crunch, you’re only targeting a very small section of the abdominal wall, plus you’re putting a lot of stress on your neck and spine while doing so. Take a look at four other exercises you shouldn’t be doing, and what to do instead.
Here’s everything you need to know about mastering the reverse crunch, and the modifications to try to make the exercise more challenging. Looking for more workout inspiration? We’ve found the best ab workouts you can do for free, the exercise that’s better than squats at building your glutes, and the dumbbell workout with over 1.3 million views.
How to do a reverse crunch
To do a reverse crunch, start by lying on your back, with your lower back, head, and neck pressed into the floor. Bend you legs at the knee, pressing your feet into the mat, and engage your core, thinking about sucking your belly button into your spine.
Keeping your knees bent, inhale, and raise your legs, hips, and bottom off the mat. Pause at the top of the movement, using your core to keep your hips raised off the mat. Your head and neck should stay imprinted on the mat. As you exhale, lower your hips back to the mat. That’s one rep.
Make sure you keep the entire movement slow and controlled. It’s tempting to rock back and forth, using momentum to raise the legs, but this won’t work the abs. If you struggle to get your hips up off the mat, try strengthening your abs using other ab exercises. This is more of an intermediate move.
It’s also important to only lift your hips and bottom from the mat — if you’re getting your entire lower back off the mat, you’re going too far. Be careful to slowly lower back down too, and avoid collapsing back onto the mat.
What muscles are worked during a reverse crunch?
The reverse crunch works the rectus abdominis and the transverse abdominis — in other words the inner core muscles, and the outer, six-pack muscles on the torso. It’s also using just your bodyweight, so you don’t need any additional equipment.
How can you make a reverse crunch more challenging?
Reverse crunches aren’t the easiest ab exercise, so it’s easy to make them more challenging by increasing the number of repetitions you do. That said, if you’re really looking for a challenge, try straightening the legs during a reverse crunch. Alternatively, at the top of the crunch, try rotating to one side, twisting the legs, then alternate from side to side. You can also try putting a medicine ball between your knees and squeezing the ball during the crunch.
The benefits of a reverse crunch
Reverse crunches are gentler on the neck and spine than ab exercises like bicycle crunches or traditional crunches, so if you’ve ever experienced neck pain during an ab workout, these are a good alternative.
Building a strong core isn’t just an aesthetic goal — it can help you run faster, lift heavier, and reduce strain on your back. Strong abs can also help improve your posture, balance, and flexibility.
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