For sore backs, yoga and acupuncture appeared the most effective, and there was some evidence to also support the use of osteopathy and relaxation therapy as well as the Alexander technique which focuses on posture and movement.

BBC: 'Few complementary therapies help arthritis'

The cerebellum is for movement, posture and learning processes associated with these two things.

ECONOMIST: A history and geography of the brain

Change your arm position and see if she will match your movement into the new posture.

FORBES: The Art and Science of Mirroring