Does your dog have an injury and your vet is having trouble diagnosing the problem? There is a series of articles written by a DVM that may be a good place to start!
Wendy Baltzer DVM is an orthopedic surgeon and head of the Rehabilitation Department at Oregon State Veterinary School. Dr. Baltzer has written a series of articles for DVM360 magazine on dog sports injuries and the articles specifically mention flyball. There are also 4 short video clips describing proper warm up and cool down exercises.
You can access the ariticles at http://veterinarymedicine.dvm360.com/vetmed/author/authorInfo.jsp?id=57276. You do not need to work for a vet to access the information.