Do Crunches Help with Belly Fat Reduction?

Nahida Wankhade

June 27, 2023

Maintaining a healthy weight can have numerous benefits, such as reducing the risk of chronic diseases like heart disease, diabetes, and certain types of cancer. Additionally, weight loss can improve physical fitness, boost energy levels, and promote a better quality of life. Exercise plays a crucial role in burning calories and creating an energy deficit, which is essential for losing weight. When combined with a balanced diet, exercise can help you in many ways. One such exercise is crunches. 

Crunches are a type of abdominal exercise that primarily target the muscles in the abdomen, including the rectus abdominis and the obliques. While crunches can help strengthen and tone the abdominal muscles, it is important to note that spot reduction is not possible. Nevertheless, crunches can be a valuable addition to a comprehensive weight loss and fitness routine, as they engage multiple muscle groups. 

What are Crunches?

Crunches are a popular form of exercise that is mainly focused to tone and strengthen abdominal muscles. This is done by lying on your back, bending your knees, and lifting your upper body off the floor. By performing controlled contractions of the abdominal muscles, crunches help to build core strength and improve muscle tone in the midsection. 

The main muscles engaged during crunches are the rectus abdominis, which are the paired muscles running vertically along the front of the abdomen, also known as the six-pack muscles. These particular muscles play a major role in spinal flexion, which is the bending of the spine forward. In addition to the rectus abdominis, crunches also activate the obliques, which are located on the sides of the abdomen and assist in rotational movements of the trunk.

How Do Crunches Aid Belly Fat Reduction?

Practicing crunches regularly can have tremendous effects on your weight. Here is how it can help you lose a few kilos. 

1. Strengthens Abdominal Muscles

Crunches are an effective exercise for strengthening the core muscles, including the rectus abdominis and obliques. It is known to improve stability and posture but also supports other movements and exercises performed during a workout.

2. Building Up Muscle Definition

Regularly incorporating crunches into a workout routine can help tone and define the abdominal muscles, resulting in a more sculpted and toned midsection.

3. Enhances overall Body Strength

Known to primarily target the abdominal muscles, crunches also engage other supporting muscles, such as the hip flexors and lower back muscles. By strengthening these muscles, crunches contribute to overall body strength and functional fitness.

4. Improves Posture and Spinal Health

Strong abdominal muscles are responsible for maintaining good posture and spinal stability. By strengthening the core through crunches, individuals can improve their posture and reduce the risk of developing back pain or injuries.

5. Boosts Calorie Burn

Although crunches alone may not burn a significant number of calories, adding them into a comprehensive exercise routine can contribute to overall calorie burn. Combining crunches with cardiovascular exercises and other forms of strength training can help create a calorie deficit necessary for weight loss.


Crunches are effective for strengthening the core muscles, improving stability, and supporting movements during workouts. They also tone and define the abdominal muscles, enhance overall body strength, support posture and spinal health, and contribute to calorie burn when combined with cardiovascular exercises and strength training.

What Should Be Your Body Alignment for Doing Crunches

The starting position for crunches involves lying on your back on a mat or a comfortable surface. Simply bend your knees and place your feet flat on the ground, hip-width apart. Then, keep your arms crossed over your chest or place your hands lightly behind your ears. Make sure you avoid any pull or strain on your neck. Ensure that your lower back is in contact with the floor/mat to maintain proper alignment throughout the exercise.

How to Do Your Crunches: A Step by Step Guide

  1. Firstly, engage your abdominal muscles by drawing your belly button towards your spine.
  2. Slowly lift your head, neck, and shoulders off the ground, while maintaining a relaxed and neutral position for your neck.
  3. Exhale as you lift, and focus on using your abdominal muscles to curl your upper body forward.
  4. Hold the contracted position for a moment, ensuring you feel the tension in your abs.
  5. In a controlled manner, lower your upper body back down to the starting position, inhaling as you do so.
  6. Repeat the movement for the desired number of repetitions, focusing on the engagement of your abdominal muscles throughout the exercise.

Guidelines on Doing Crunches for Belly Fat Reduction

  1. Avoid using momentum: Do not lift your upper body using momentum. The correct way to do it is to be in a slow and controlled manner. You will feel the contraction of your abdominal muscles.
  1. Initiating with your head and neck: The primary movement should come from your abdominal muscles, not from the head and neck. Avoid pulling your head forward excessively.
  1. Straining the neck: Keep your neck in a relaxed and neutral position, focusing on the contraction of the abdominal muscles. Do not pull on your neck with your hands or strain your neck muscles. 
  1. Lack of maintaining proper alignment: Remember to keep your lower back always in contact with the floor/mat throughout the exercise to ensure proper alignment and avoid unnecessary strain on your back.
  1. Overarching the lower back: Do not try to do excessive arching of the lower back as you lift your upper body. This can lead to strain and discomfort.
  1. Holding your breath: Remember to breathe throughout the exercise. Exhale as you lift your upper body and inhale as you lower it back down.

By following these proper techniques and avoiding common mistakes, you can maximize the effectiveness of crunches while minimizing the risk of injury or strain. Also, it is always beneficial to consult with a fitness coach or personal trainer to ensure proper posture and technique for performing crunches and other exercises.

How to Effectively Incorporate Crunches into Your Weight Loss Training

How many crunches to lose weight?

Do listen to your coach or trainer since they will help you get the best result. However if you are a beginner, it is important to consider the frequency and duration of crunches within a weight loss program. You can generally perform crunches 2-3 times per week. This can be sufficient to engage and strengthen the abdominal muscles. Aim for 2-3 sets of 10-15 repetitions per session. However, it is essential to listen to your body and gradually increase the intensity and volume of crunches over time as your fitness level improves.

Crunches and Other Exercises

Just focusing on crunches will not get you desired results and will not contribute to your overall fitness or weight loss. Combine doing crunches with other exercises to create a comprehensive workout routine for weight loss. You can add cardio exercises like running, cycling, or swimming to help burn calories and promote overall fat loss. Strength training exercises like squats, lunges, and push-ups should also be included to build muscle and increase metabolism. Remember to engage in a variety of exercises that target different muscle groups.

Variations of Crunches 

There are several variations of crunches that can help in weight loss and target different areas of the abdominal muscles. These variations add variety to your workout routine, engage different muscle fibers, and increase the intensity of the exercise. Here are a few examples:

  1. Bicycle Crunches: Bicycle crunches are a dynamic variation that targets not only the rectus abdominis but also the obliques. You need to lie on your back, bring your knees up, and mimic a pedaling motion in a cycle. Also, alternatively touch your elbow to the opposite knee while extending the other leg.
  1. Reverse Crunches: Another popular variation of crunches is the reverse crunches. This primarily targets the lower abdominal muscles. Here, you lie on your back with your legs bent and knees raised. In this type of crutches, you lift your hips off the ground by curling your pelvis upward towards your chest instead of lifting your upper body. Focus on engaging the lower abdominal muscles.
  1. Vertical Leg Crunches: Vertical leg crunches are a modification of the traditional crunch that intensifies the workout for the upper abdominal muscles. Here is how it is done, you lie on your back with your legs extended vertically towards the ceiling. Lift your upper body, extending your hands towards your feet while keeping your legs straight.
  1. Plank Crunches: Plank crunches combine the benefits of both planks and crunches. It is phenomenal, as it engages the entire core. Start in a plank position with your forearms on the ground. While maintaining a straight body line, engage your abdominal muscles and draw one knee towards your chest. Return to the starting position and repeat with the other knee.
  1. Oblique Crunches: Oblique crunches specifically target the oblique muscles located on the sides of your abdomen. Lie on your back, cross one ankle over the opposite knee, and perform a crunch while twisting your torso to bring your elbow towards the opposite knee. Alternate sides for an effective oblique workout.


Various crunch variations target different abdominal muscles and add variety and intensity to workouts. Bicycle crunches engage the rectus abdominis and obliques, while reverse crunches target the lower abs. Vertical leg crunches work the upper abs, plank crunches engage the entire core, and oblique crunches focus on the side muscles. These variations provide options for a well-rounded abdominal workout.

Precautions Before Starting with Crunches

1. Consulting with a healthcare professional:

Before incorporating crunches or any other exercise into a weight loss program, it is important to consult with a healthcare professional. They can assess your overall health, provide personalized recommendations, and ensure that you are physically capable of performing crunches safely.

2. Modifications for individuals with injuries or physical limitations:

Individuals with injuries or physical limitations should take precautions and modify crunches accordingly. For example, if you have lower back issues, you may need to perform crunches with your legs elevated or use a stability ball for support. It’s essential to listen to your body and work within your comfort level to avoid straining your condition or causing new injuries.

3. Gradually increasing intensity and difficulty:

To prevent plateauing and continue seeing progress, it’s important to gradually increase the intensity and difficulty of crunches over time. This can be achieved by adding resistance, such as using resistance bands, or by incorporating advanced variations of crunches. Gradual progression helps challenge the muscles, promotes strength gains, and avoids overloading the body too quickly, reducing the risk of injury.

HealthifyMe Suggestions

Crunches isolate your abs completely. Because of that isolation, they are superior in terms of potential results  when compared to sit ups. Crunches are better for beginners who are learning to activate their core, and for more experienced exercisers too, because the more focused and isolating move will give better results. When choosing crunches movements, it’s necessary to perform exercises that are challenging, isolate the abs directly, and take you through a longer range of motion.


Crunches are beneficial for weight loss as they strengthen the core, improve muscle tone, enhance overall body strength, support posture and spinal health, and contribute to calorie burn when combined with cardiovascular exercises and strength training in a comprehensive workout routine.

Start incorporating crunches into your fitness routine. Strengthen your core, sculpt your abs, improve posture, and support your weight loss goals. With proper form and progression, crunches can be an effective addition to your exercise regimen. Take the first step towards a healthier you!

Disclaimer: The purpose of this article is just to disperse knowledge and raise awareness. It does not intend to replace medical advice from professionals. For further information please contact our certified nutritionists Here

Frequently Asked Questions (FAQs)

1. Are crunches good for losing belly fat?

Crunches alone are not sufficient for losing belly fat. While they strengthen the abdominal muscles, reducing belly fat requires a combination of regular exercise, a balanced diet, and overall calorie burn through cardiovascular exercises and a healthy lifestyle.

2. Can I do 100 crunches a day to lose belly fat?

Simply doing 100 crunches a day will not guarantee belly fat loss. While crunches can contribute to muscle toning, losing belly fat requires a comprehensive approach that includes a calorie deficit, a balanced diet, and a combination of cardiovascular exercises and strength training.

3. Which exercise burns the most belly fat?

No single exercise exclusively targets belly fat. Instead, engaging in a combination of cardiovascular exercises, such as running, swimming, or cycling, along with strength training exercises that target multiple muscle groups, will help burn overall body fat, including belly fat.

4. How many crunches should I do to lose belly fat fast?

The number of crunches needed to lose belly fat fast varies for each individual. Rather than focusing solely on crunches, incorporate a variety of exercises into your routine and aim for overall calorie burn through a combination of cardiovascular exercises, strength training, and a healthy diet.

5. Can I do crunches every day?

While crunches can be performed regularly, it is generally recommended to give your muscles time to rest and recover. Aim for 2-3 days a week of crunches, allowing at least one day of rest in between, and incorporate other exercises to create a well-rounded fitness routine.

6. Do planks burn fat?

Planks are an effective core-strengthening exercise but do not directly burn fat. Like crunches, planks alone will not lead to fat loss. However, incorporating planks into a comprehensive workout routine, combined with cardiovascular exercises and a healthy diet, can contribute to overall fat burning and a stronger core.

Research Sources

  1. Comparison of overall obesity and body fat distribution in predicting risk of mortality
  2. Short-term effect of crunch exercise frequency on abdominal muscle endurance
  3. The effect of abdominal exercise on abdominal fat
  4. Effects of combined aerobics and abdominal strengthening exercises on abdominal adiposity in sedentary adults

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