The dead bug is T1 in the core progression — anti-extension stability training at low load. It looks almost laughably simple. You’re on your back, moving your arms and legs slowly. The catch: your lower back cannot leave the floor. Not a millimeter. That constraint is the entire exercise.
Anti-extension core stability — the ability to resist spinal extension when limbs are moving or weight is applied — is the fundamental core capacity that the hollow body, plank, L-sit, and dragon flag all require. The dead bug trains it in isolation before adding any load.
Form
Setup. Lie on your back, arms vertical, hips and knees at 90 degrees. Press your lumbar spine firmly into the floor — actively eliminate the arch. This is your start position.
Movement. Keeping your back flat, simultaneously lower your right arm overhead and extend your left leg toward the floor. Move slowly — 3–4 seconds each way. Return. Switch sides.
The standard. Your lower back must stay in contact with the floor throughout. If it lifts, you’ve lost the exercise. Reduce range — don’t lower the arm/leg as far — until you can maintain contact.
Why It Transfers
The dead bug directly precedes the hollow body hold — which is the same anti-extension demand, inverted. Every advanced core skill in this progression traces back to this ability to maintain a neutral spine under load. It’s not a warm-up. It’s the foundation.
Progression Standards
3 sets × 10 reps each side, back flat throughout, consistent → Hollow Body Hold →
Move. Groove. Repeat. Smooth.
Next: Hollow Body Hold →
Move. Groove. Repeat. Smooth.
You're on your way. And we're here with you.