Dumbbell Decline Crunch (Behind Head)

What you'll gain

• Adds external resistance to a trunk-flexion exercise.

• Demonstrates a controlled partial curl rather than a sit-up.

• Keeps the lower body supported while the abdominals work.

Step-by-Step Instructions

1. 1

   Secure the legs under the decline bench rollers.

2. 2

   Support a manageable dumbbell with both hands behind the head.

3. 3

   Keep the pelvis settled on the pad and the neck aligned with the trunk.

4. 4

   Curl the upper back away from the bench by shortening the abdominal wall.

5. 5

   Pause within the small crunch range without sitting fully upright.

6. 6

   Lower under control while keeping the dumbbell steady.

Common Mistakes

• Turning the small crunch into a full hip-driven sit-up.

• Pulling the head forward with the hands or weight.

• Swinging the dumbbell to start the upward movement.

• Lifting the pelvis away from the bench.

About This Exercise

This decline crunch keeps the movement in the trunk: the upper back curls away from the bench while the pelvis stays supported. A dumbbell held behind the head adds resistance to the small curling motion. The feet remain under the bench rollers and the elbows stay open through the repetition. The side view distinguishes the exercise from a full sit-up. The torso never needs to become upright; the visible action is a repeated curl and controlled lower with the abdominal wall highlighted. It is a loaded variation for a core exercise library with a clear bench and hand position.

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