Extension-Based Posture

Arching into extension during the drill is the error to avoid; the back should remain flat with hips tucked. The drill is specifically designed for people who tend to hold an extension-based posture.

1 sources - 2 claims

Arching into extension during the drill is the error to avoid; the back should remain flat with hips tucked. The drill is specifically designed for people who tend to hold an extension-based posture.