Dead Bug

The Dead Bug is a fundamental core stability exercise performed lying on your back with alternating limb movements, developing anti-extension core strength and coordination. This accessible movement is ideal for all fitness levels and those seeking improved core stability, spinal control, and functional core strength. The dead bug challenges core control through opposite arm and leg movement patterns.

NASM's evidence-based approach emphasizes functional core exercises for developing practical stability and movement control. The dead bug improves core stability, develops coordinated movement patterns, and translates to improved functional movement quality and injury prevention.

How to Perform the Dead Bug

Step 1: Setup

Lie on your back with your arms extended toward the ceiling perpendicular to your torso. Position your legs with knees bent at 90 degrees and hips bent at 90 degrees.

Step 2: Brace/Position

Engage your core by drawing your navel toward your spine. Maintain a neutral spine and press your lower back into the floor throughout the movement.

Step 3: Execute/Drive

Extend your right arm overhead while simultaneously extending your left leg, maintaining core engagement. Stop just short of touching your arm and leg to the floor, then return to starting position.

Step 4: Return/Descent

Alternate sides with controlled movement, extending your left arm and right leg in alternating fashion. Maintain constant core engagement throughout all repetitions.

Muscles Worked

Primary Muscles:

• Rectus Abdominis – primary stabilizer resisting spinal extension during limb movements
• Transverse Abdominis – deep stabilizer providing spinal stability throughout movement

Secondary Muscles:

• Obliques
• Core Stabilizers

Common Mistakes

• Allowing the lower back to arch away from the floor, indicating core disengagement
• Jerky or uncontrolled limb movements, which compromises core stability
• Moving too quickly without maintaining spinal control
• Extending limbs too far, which removes core tension
• Holding the breath, which reduces intra-abdominal pressure and core stability

Dead Bug Variations

• Bird Dog
• Plank
• Reverse Crunch to Knee Up With Rotation

As part of NASM's evidence-based approach to movement and strength training, the dead bug reinforces proper movement mechanics essential to long-term performance and injury prevention. NASM-certified personal trainers use the Optimum Performance Training (OPT) model to integrate exercises like the dead bug into individualized programs based on each client's assessment results.

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