Stronger

Crunch

Crunch demonstration

Category

isolation

Difficulty

beginner

Equipment

bodyweight

Force Type

pull

How to Perform the Crunch

  1. Lie on your back on the floor or a mat with your knees bent and feet flat on the ground, hip-width apart.
  2. Place your fingertips lightly behind your ears or cross your arms over your chest. Do not clasp your hands behind your head.
  3. Engage your core by drawing your belly button toward your spine and pressing your lower back into the floor.
  4. Exhale and curl your upper back off the floor by contracting your abs, lifting your shoulder blades 3-4 inches off the ground.
  5. Hold the top position for one second, squeezing your abs as hard as possible.
  6. Slowly lower your shoulders back to the floor under control, but do not fully relax at the bottom. Maintain tension in the abs throughout the set.

Common Mistakes to Avoid

Pulling on the neck with the hands

Keep your fingertips lightly behind your ears. Your hands should provide no pulling force. Look at the ceiling to maintain a neutral neck.

Using hip flexors to sit all the way up

Only curl your upper back off the floor. This is a crunch, not a sit-up. Your lower back should remain on the ground.

Rushing through reps

Perform each rep with a slow, controlled tempo. Focus on squeezing the abs at the top rather than counting fast reps.

Muscles Worked

Benefits

  • Simple, equipment-free exercise that can be performed anywhere to build abdominal strength and definition.
  • Low impact on the lower back compared to sit-ups, as the lower spine stays in contact with the floor.
  • Easily scalable from beginner to advanced by adding resistance or changing the angle.

Pro Tips

  • Exhale forcefully as you crunch up to maximally contract the abs and draw the ribcage toward the pelvis.
  • To increase difficulty, hold a weight plate or dumbbell on your chest, or try the exercise on a decline bench.
  • Focus on quality contractions rather than quantity. Slow, controlled crunches are far more effective than rapid, partial reps.

Recommended Sets & Reps

Strength

4-5 sets of 10-15 reps (add weight on chest)

Hypertrophy

3-4 sets of 15-20 reps with controlled tempo

Endurance

2-3 sets of 25-30 reps at bodyweight

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