Crunch (on Bench) Waist Max

1. Lie on your back on a flat bench with knees bent and feet flat on the bench or hooked under the end.
2. Place the hands lightly behind the ears or crossed over the chest, elbows wide.
3. Press the lower back gently into the bench and tuck the chin slightly.
4. Exhale and curl the shoulders and upper back off the pad, driving the ribs toward the hips.
5. Stop when the shoulder blades are clear of the bench and squeeze the abs for one second.
6. Lower slowly over two seconds until the shoulders touch the pad without relaxing fully.
7. Repeat in a steady rhythm, keeping the neck relaxed and the hips still.

Common Mistakes

• Pulling on the neck: Yanking the head forward with the hands strains the neck and lets the abs rest. Keep the fingertips light behind the ears and lead with the chest.
• Sitting all the way up: Rising past the shoulder blades turns the crunch into a sit up and brings in the hip flexors. Stop when the shoulder blades clear the pad.
• Rushing the reps: Bouncing up and down uses momentum. Use a two-second lower and a one-second squeeze at the top.

Programming Tips

Program 3 to 4 sets of 12 to 20 reps at the end of a session or in a short core block two to three times per week. It is a pure rectus abdominis exercise with a short range, so pair it with a plank or carry for stability and a leg raise for the lower abs.

Set up on a flat bench with the lower back pressed down and the hands light at the ears. Start with bodyweight and build to 20 slow reps, then progress by holding a 2.5 to 5 kg plate on the chest or adding a two-second pause at the top. The most common fault is pulling on the head and neck; fix it by crossing the arms over the chest and lifting with the ribs.

Common Questions

What does the crunch on a bench work?

It works the rectus abdominis, with the obliques assisting to keep the trunk steady. The hip flexors contribute very little because the shoulders only lift a short distance.

Is a crunch on a bench better than on the floor?

The bench version is slightly more comfortable for the spine and lets the feet be secured, but the ab work is nearly identical. Choose whichever lets you keep the lower back pressed down.

Are crunches bad for your back?

For healthy backs, short-range crunches with the lower back pressed into the bench are safe. Anyone with a current disc problem should prefer planks and dead bugs instead.

How many crunches should I do a day?

Three sets of 12 to 20 slow reps two to three times per week is enough; daily high-rep crunches add fatigue without extra results. Add a plate on the chest when 20 reps feel easy.