Place your hands on the box and get into a high plank position. Then, use your shoulders to glide the carriage forwards and backwards.
1B.
Down or up.
Short Box.
Exhale to rock forward, inhale to return to plank.
Develop muscular strength of the transverse abdominis, pelvic floor, multifidus, and obliques. Scapular and pelvic stabilisers.
Progression: 1Y.
Regression: 1B or knees on the platform, hands on the carriage. Find a 3/4 plank, push the carriage away, then bring wrists back under shoulders (foam protector needed).