What’s up ? This is THE stephane ANDRE ! I read a Frederic Delavier’s book « Strength Training Anatomy » and I learned good stuff.
Standing wit your legs slightly apart with one hand behind your head and a dumbbell in the other hand :
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Do a lateral flexion of your torso on the opposite side of the dumbbell
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Return to the start position or go beyond it by doing a passive flexion of your torso.
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Alter the sets by changing the dumbbell aside without recovery time.
This exercise works mainly on the flexion side obliques and a little bit rectus abdominis, deep muscles of the back and quadratus lumborum.
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-Steph