Weighted Crunch

Diagram of a man doing a weighted crunch exercise, showing the start position with muscles engaged and the finish position with muscles contracted, highlighting the abdominal muscles.

Exercise Description

The Weighted Crunch is a progression of the traditional crunch that increases resistance by holding a weight against the chest or behind the head. By adding external load, the exercise places greater demand on the abdominal muscles, making it effective for building core strength, muscular endurance, and abdominal hypertrophy. The movement focuses on spinal flexion, allowing the rectus abdominis to work through a controlled range of motion while minimizing excessive involvement from the hip flexors. The exercise can be performed using a weight plate, dumbbell, medicine ball, or other suitable resistance.

Primary Muscles Worked

  • Rectus Abdominis

Secondary Muscles Worked

  • External Obliques

  • Internal Obliques

  • Transverse Abdominis

  • Hip Flexors (Minimal Involvement)

  • Serratus Anterior

  • Shoulders and Arms (Weight Stabilization)

How to Perform Correctly

Setup

  1. Lie flat on your back on an exercise mat.

  2. Bend your knees and place your feet flat on the floor approximately hip-width apart.

  3. Hold a weight plate, dumbbell, or medicine ball against your chest.

  4. Engage your core and gently press your lower back into the floor.

  5. Keep your head and neck in a neutral position.

Movement

  1. Contract your abdominal muscles and lift your head, shoulders, and upper back off the floor.

  2. Focus on curling your ribcage toward your pelvis rather than simply lifting your head.

  3. Raise only until your shoulder blades clear the floor.

  4. Pause briefly at the top position and squeeze your abdominals.

  5. Slowly lower yourself back to the starting position under control.

  6. Maintain constant tension on the abdominal muscles throughout the set.

  7. Repeat for the desired number of repetitions.

Common Mistakes to Avoid

Using Excessive Weight

  • Heavy resistance often reduces abdominal engagement and encourages poor technique.

Pulling the Head Forward

  • Keep your neck neutral and allow the abdominals to perform the work.

Using Momentum

  • Lift and lower under control rather than jerking the body upward.

Turning the Exercise into a Sit-Up

  • Only lift the upper back from the floor to maintain abdominal isolation.

Holding the Breath

  • Breathe steadily throughout each repetition.

Allowing the Lower Back to Arch

  • Maintain gentle contact between the lower back and the floor.

Rushing the Repetitions

  • Focus on controlled contractions rather than speed.

Abs Exercises