Which of the following is a Step Barrel extension exercise?

• A. Back Arch and Bridge
• B. Swan Dive
• C. Corkscrew
• D. Side Sit-ups

Answer: (A)

Step Barrel extension exercises involve lengthening the front of the body and extending the spine over the curved surface, typically followed by a bridge to engage the posterior chain and hips. Back Arch and Bridge fits this pattern precisely: you position the torso along the Step Barrel to create a controlled back extension over the barrel, then press into a Bridge to lift the hips and strengthen the glutes, hamstrings, and spinal extensors while promoting alignment.

The other moves don’t match this extension-on-the-barrel pattern. Corkscrew emphasizes twisting the spine, Side Sit-ups focus on lateral flexion and oblique work, and Swan Dive is a dynamic back-extension/movement not performed as a Step Barrel extension exercise.