Stand with your feet a little wider than hip-distance apart, holding a dumbbell over your head. Squeeze your head with your upper arms to fire up your core and protect your neck.
Bend sideways to the right, squeezing your waist on the right side, but focus more on the energy of your torso stretching upward rather than collapsing to the side. Keep your neck as neutral as possible, looking forward, not down.
Pull the left ribs down to return to standing upright, to complete one rep. This focuses the work on the left obliques.