Cross Lateral Walking
Stand in a non-slouched posture. Slowly start walking in place, lifting the knees and swinging the arms. Try touching the left knee with the right elbow, then the right knee with the left elbow (most adults will not be able to do this, but wrist or forearm may be able to touch.
Rationale: Cross body movement of all kinds strengthens the corpus callosum between the sides of the brain. The challenge to balance stimulates the vestibular system, and the slow movement requires the involvement of the fine motor system.
Source: Dr Paul Dennison, described in the book Smartmoves by Carla Hannaford, Ph.D