Sally Goddard Blythe is director for the institute of neuro-physiological psychology in England. She's researched and written extensively on the role of movement in brain development. This book explains why both doctors and parents should realize that (as Anat Baniel puts it) "Movement in a baby is the brain learning."
This book also explains the concept of retained infant reflexes, something which parents of LD children in particular should know. (Babies are born with reflexes, which are two or more connected movements. One example is the startle reflex. If you're startled, your hands jerk. Some of these reflexes disappear relatively quickly -- integrated into regular brain development. Other reflexes are used as the basis for development. Studies show that 70% of children with learning disabilities still have reflexes that should have disappeared with regular brain maturity. There are exercises that children can do to "integrate" these reflexes, presumably helping the child hit a higher level of development.)
This book not only contains great introductory information, but it tells you why movement is so integral to the brain, and explains why development of the vestibular system, the proprioceptive system (the sense where the brain knows where its body is, even if eyes are closed), and other systems, must be mature before a child can succeed in school.
Finally, it contains all sorts of exercises and drawings to illustrate every concept. Not cheap, but awesomely informative.