What is crossed dominance?
Cross-dominance, also known as mixed dominance, is when a child favors one side of the body over the other for some tasks and not all tasks. Most of us are either all right side or left side dominant, meaning right eye, ear, hand and foot. We test this in the clinic, by assessing eye, ear, hand and foot dominance.
http://www.scientificamerican.com/article/bring-science-home-dominant-side/
Carla Hannaford has written a book "The Dominance Factor" which describes in more detail crossed dominance. Please refer to the book review below:
http://www.mybrain.co.uk/public/extra_book_6.php
EXERCISES:
Crossed hand boxing
Cross crawls (Brain Gym)
Macarena dance
Bal-A-Vis-X exercises with racquet ball
Sports which include crossing midline