Performing the ab crunch is an efficient way to develop strong abdominal muscles. Start with the basic crunch moves and, once you feel stronger, progress to variations of the classic crunch exercise.
Steps

Bend your knees and rest the pads of your feet flat on the floor.

Place your right hand on your left shoulder and your left hand on your right shoulder, crossing your arms in front of your chest or behind your head. This position provides a stable base for the movement.
Slowly tighten your abdominal muscles by drawing your stomach inward towards your spine.
Keep your heels on the floor and your toes straight, lightly lifting your head first, followed by your shoulders. Focus your gaze towards your knees while engaging your abdominal muscles. Curl your torso off the ground until you form a 90-degree angle or until your elbows touch or pass your knees.
Hold that position for a moment. Slowly return your upper body to the ground, but try to keep a slight distance from the floor, creating a slight arch. Maintain comfort while in this position.
Repeat steps 3-5 for this exercise. If you're a beginner, aim for two to three repetitions and gradually increase the number as your endurance improves. You might even experience weight loss!
Other types of abdominal crunch exercises
Strengthen your abdominal muscles with the side crunch exercise.
Engage in the bicycle crunch to work your leg muscles while toning your core.
Target your lower abs with the reverse crunch movement.
Use an exercise ball for crunches if you have back pain and wish to minimize strain on your back muscles.
Perform V-sit crunches to engage your entire upper body and legs for a full-body workout.
Learn the military-style crunch if you're planning to join a boot camp for newly recruited marines.
Advice
- If you struggle to keep your feet or heels on the ground, try to persist or ask a friend to help hold them down. You can also use a heavy object (like a sofa) and place your feet under it. This will help lift your upper body.
- Moderation is key for any abdominal exercise, as your core is the center of your body. Think about it – every action you do (walking, running, sitting, standing, reaching for something, etc.) engages your abs. Overdoing crunches can leave you sore the next day, affecting your ability to complete other tasks. If you're a beginner, start slowly and gradually increase the number of repetitions.
- As you get stronger, try a Pilates variation of this exercise: Instead of placing your hands behind your head or on your shoulders, keep your arms straight beside your torso. When you lift your body to crunch, slide your hands forward and lift them as you raise your torso. Keep your shoulders relaxed and avoid tilting your head too far forward. Slowly lower your arms back to the ground beside your torso as you return to the starting position. Repeat this for each crunch.
- Be cautious and limit your reps in the beginning, doing just a few to avoid injury.
- Inhale as you crunch, and exhale as your back lowers toward the ground. This ensures oxygen circulates throughout your body.
- Always practice proper breathing when performing any type of crunch.
- If you're starting with military-style crunches, make sure to warm up your muscles first. Go slow to avoid injury.
- If you lack the endurance to do a full set of crunches, break it up into three 15+15+15 sets throughout the day.
Warning
- Remember, the only way to build muscle is to push your muscles to their limit. However, if you overdo the crunches to the point where you feel abdominal pain, you may have gone too far. Your form will begin to suffer, and you won't be able to perform crunches effectively or safely.
- Avoid doing crunches if you've been diagnosed with osteoporosis. Bending your spine during crunches places significant pressure on your bones, which can increase the risk of fractures.
- Don't make these common mistakes when doing crunches:
- If you decide to remove your hands from behind your head to avoid discomfort, make sure you don’t push your head forward when lifting your torso. This is a natural tendency, as it helps you lift, but it increases strain on your neck muscles. If you place your hands elsewhere, avoid letting your head be affected by the movement.
- Don’t force your forehead to touch your knees. It’s fine to lift your torso as high as you can, but only to a point. If your back begins to curve (similar to slouching), you'll put unnecessary stress on your lower back.
- If you can't keep your feet grounded and don’t have a way to hold them down, you’ll expend more energy trying to do so during your crunches. Unfortunately, this effort will come from your thighs, which aren't the target area for this exercise. Some people may feel thigh fatigue before their abs, making the entire exercise ineffective.
