Start seated upright with pelvis and spine neutral. Legs long and abducted slightly wider than shoulder-distance apart, ankles dorsiflexed. Arms reaching out to sides, palms forward. Inhale and rotate spine around vertical axis, keeping pelvis still and raching arms to corners. Exhale and sequentially articulate spine into flexion from head, reaching front arm toward baby toe as back arm medially rotates and reachees to back corner. Eye-focus straight down and pelvis remains vertical. Inhale and contract abdominals and slide scapulae down as back arm reaches behind, rolling up through spine and sequentially articulating out flexion from tail to reestablish vertical. Exhale and rotate spine to face forward. Back arm rotates laterally on return to starting position, with palms facing forward.