Typically developing toddlers like to defy gravity whether it be spinning around in Daddy's arms, swinging in the backyard, or jumping on the bed. But when a toddler has consecutive ear infections, sensory processing disorder, low muscle tone, or any other thing that impairs balance, movement may not be so fun for them.
Below is a link that gives ideas to add movement into a toddler's play routine:
How to Improve a Toddler's Balance & Vestibular Processing Skills During Play | eHow.com
The vestibular system, located in the inner ear, is in charge of balancing the body every time the head moves. Muscle tone, bones (orthopedic alignment), nerves, and the eyes also have a big role in balancing too. If something is wrong with any of those body parts, then the person can have poor balance. So, if your toddler is absolutely terrified of movement in some directions no matter what you do, then he may need an occupational or physical therapy evaluation to determine the cause.