How to Do an Abdominal Crunch with Good Form
A well-performed abdominal crunch is a small, controlled movement rather than a full sit-up. The aim is to use your abdominal muscles while keeping your neck, shoulders and lower back comfortable.
Set up your position
Lie on your back on a mat with your knees bent and your feet resting flat on the floor. Place your feet at a comfortable distance from your hips, roughly in line with your knees, and let your lower back keep its natural shape.
Rest your fingertips lightly beside your head, cross your arms over your chest or reach your hands towards your thighs. Avoid gripping or pulling your neck, and keep your elbows relaxed if your hands are near your head.
Perform the crunch
Gently tighten your middle, then breathe out as you lift your head and shoulder blades a short distance from the floor. Think about bringing your ribs towards your pelvis without forcing your chin towards your chest.
Pause briefly at the top while keeping the movement controlled. Breathe in as you slowly lower your shoulders to the mat, then reset before beginning the next repetition.
Keep the movement focused
A crunch does not need a large range of motion. Your lower back and pelvis should remain steady while your upper spine curls, with your abdominal muscles doing the work rather than momentum.
Keep a small space between your chin and chest, as though you are holding a soft ball there. Look upwards rather than towards your knees, and stop the set when you can no longer maintain the same controlled form.
Adjust it to suit you
Choose a number of repetitions that lets you move smoothly without straining or rushing; the right amount depends on your current ability. Rest between sets and prioritise consistent technique over completing more repetitions.
To make the exercise gentler, keep your arms reaching towards your thighs and lift only as far as feels comfortable. To increase the challenge, slow the lowering phase or pause at the top, but avoid adding difficulty if it causes discomfort or changes your form.