Parents say that Gail Gagne's "Yoga for the Special Child" program is "sorely needed" at Glenwood Community Centre in Winnipeg, Canada   Gagne rents space from the Community Centre to run her Yoga for the Special Child Program. Four children with a variety of disabilities, including autism, attend on a weekly basis. Parents say that participation in the class has benefited their children in a numerous ways, from improved muscle tone to enhanced ability to focus to sharpened social skills.   The Yoga for the Special Child Program is also an athletic outlet for children that, unfortunately, may have limited