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Crunch

Abs Isolation Bodyweight
Demo (loops)

How to do it

Starting position

  1. Lie on the mat, bend your knees, and plant your feet on the floor
  2. Set your feet hip-width apart and cross your arms over your chest
  3. Look toward the ceiling and lightly tuck your chin

Movement

  1. Engage your abs and curl your upper body up
  2. With your upper body raised, give your abs a brief squeeze
  3. Slowly return to the starting position

Breathing

Exhale as you raise your upper body and inhale as you lower it

Trainer tips

  • Curl your ribs toward your pelvis
  • Keep your lower back pressed against the floor as you come up
  • Exhale and squeeze your abs

Cautions

  • Raising your upper body too high strains your lower back, so only lift slightly
  • Pulling on the neck with the hands
  • Lifting all the way up through the lower back, turning it into a sit-up
  • Coming up quickly with momentum

If you feel pain during the exercise, stop. If it continues, talk to a professional.

Exercise info

Primary musclesAbs
EquipmentBodyweight
Movement patternCore
Rep range12–20 reps
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Representative exercise: Machine Lying Crunch

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This information is based on our analysis of public content from evidence-based training experts in Korea and abroad. It is not a substitute for medical advice. Weights and sets differ from person to person. The GYMKC app uses the sets you log to calculate the weight and reps for your next set.