How to do sit-ups the right way: The classic exercise most people get wrong

Are you trying to get into fitness? Well, one place to start is no-equipment home exercises, and sit-ups are one of the most popular. Many people don’t think many ab exercises are better than sit-ups because of how accessible they are. You just need the ground, your body weight, and maybe a mat. 

However, to reap the benefits of the exercise, you have to learn how to do sit-ups properly. Well, that’s no longer a problem because we’ve laid out everything you need to know. Keep reading to learn how!

What muscles do sit-ups target?

Sit-ups target the abdominal muscles, specifically the rectus abdominis, which is the muscle that helps you “crunch” your torso forward. Also, sit-ups can engage the obliques (the muscles on the sides of your abdomen) and the hip flexors. 

Additionally, research shows that sit-ups target the rectus femoris (part of the quadriceps in the thigh) and the lower back to a lesser extent. Overall, this exercise is great for strengthening the abs and core area.

What are the benefits of sit-ups?

Core strength

Regularly performing sit-ups builds strength in your core muscles, which include the abdominal and lower back muscles. You need your core for virtually every exercise, so this increased strength will translate into overall fitness and everyday activities.

Posture improvement

Strong abdominal muscles contribute to better posture by supporting the spine. This may help reduce back pain and improve overall body alignment.

Improved flexibility and aesthetics

Moving your spine and hips during sit-ups can increase spinal flexibility and reduce stiffness. While this happens, sit-ups also build the rectus abdominis, the muscle responsible for the six-pack, which studies show is one of the most attractive muscle groups.

How to perform a sit-up

Here’s a simple step-by-step guide to performing a sit-up correctly. 

Instructions:

1. Lie on your back on a mat with your knees bent and feet flat on the ground. Your feet should be hip-width apart. Secure your feet if needed, but try to minimize reliance on this as you progress. 
2. Place your fingertips behind your ears or cross your arms over your chest. Avoid interlocking your fingers behind your head to prevent neck strain.
3. Before you begin, tighten your deep core muscles by gently sinking your belly button into your spine. 
4. Slowly lift your head first, followed by your shoulder blades. Keep your eyes on the ceiling to avoid pulling with your neck. Continue to lift until your chest is close to your knees. Remember, the movement should be smooth, not jerky. 
5. Hold at the top of the rep for a second or two. This pause can help increase muscle activation and help you stay mindful of using the proper form.
6. Slowly lower yourself back down to the starting position. 

Optimal sets and reps: 3 to 4 sets of 15 to 30 reps

Sit-up variations to try

Twisting sit-up

As you come up in the traditional sit-up, twist your torso toward one side, bringing the opposite elbow toward the knee on the twisting side. Alternate sides with each rep. This variation would target the obliques as well as the rectus abdominis.

Weighted sit-up

Hold a weight plate or dumbbell on your chest or above your head to add resistance as you perform the sit-up. This increases the intensity and strengthens the core muscles more effectively.

Elevated feet sit-up

Perform the sit-up with your feet elevated on a bench or step. This variation increases the intensity of the exercise by adding more resistance to strengthen the core.

Bicycle sit-up

Lie on your back with your hands behind your ears. Lift your shoulders off the ground and bring one knee toward your chest while rotating your opposite elbow toward the knee. Alternate the sides in a pedaling motion. Like the twisting sit-up, this works both the rectus abdominis and the obliques.

Common mistakes to avoid

Focus on getting six-pack abs and minimize the risk of injury during sit-ups by avoiding these common mistakes: 

1. Pulling on the neck: Pulling on the neck can strain the neck muscles and lead to discomfort or injury. Keep your hands lightly behind your ears or across your chest instead. 
2. Using jerky movements: Using momentum to jerk the body up reduces the exercise’s effectiveness and increases the risk of back injury. Focus on controlled, deliberate movements. 
3. Arching the lower back: If your lower back arches off the floor as you perform a sit-up, it can put undue stress on your back. Engage your core throughout the movement to keep your lower back pressed into the floor. 
4. Holding your breath: Proper breathing is crucial in all exercises, including sit-ups. Breathe out as you lift your body, and breathe in as you return to the starting position. 
5. Tucking the chin into the neck: This position strains the neck. Imagine holding an orange under your chin throughout each set to maintain proper alignment. 

Frequently asked questions

Can sit-ups reduce belly fat?

Sit-ups can strengthen and tone the abdominal muscles but are not specifically effective for reducing belly fat. It’s a misconception that you can reduce fat by training the muscles in the area where you want to lose fat. To reduce belly fat, engage in resistance training and cardiovascular exercise and eat a protein-rich, healthy diet that focuses on a calorie deficit.

How many sit-ups should I do a day?

The number of sit-ups you should do per day depends on your general fitness level, goals, and overall exercise routine. Beginners could do 1 or 2 sets of 10 to 15 reps daily, while intermediate-level enthusiasts can take on multiple sets of a similar rep range. Advanced fitness enthusiasts, on the other hand, could perform high-rep sets and even incorporate harder variations like weighted sit-ups.

Is 100 sit-ups a day good?

Performing 100 sit-ups a day is an ideal goal, even if you’re a beginner. However, it’s expedient to pace yourself and slowly become stronger until you reach that point. Also, you likely cannot perform all those reps in one set. So, break down the 100 sit-ups into chunks of manageable sets and attempt the goal from there.

What is the difference between crunches and sit-ups?

These two exercises can easily be confused, as they involve the same general movements, and both target the abdominals. However, there is a slight difference. When you perform a crunch, the focus is to lift the shoulder blades off the floor as you contract your abs. With sit-ups, you will bring your entire upper body off the floor during the contraction.

Are sit-ups dangerous?

As long as sit-ups are done with proper form, they aren’t dangerous. In some instances, someone could strain their neck. However, this is easily remedied by placing your hands lightly behind your head for support. Overall, most people can do sit-ups without any risk.