When they go to the canter Laura asks them for counter canter and he offers changes instead.  They patiently continue on the circle in the counter canter while asking for changes in the flexion from left to right.  Laura explains the necessity of rideability and being able to move the shoulders, hindquarters and flexion to wherever the rider wants while in the canter to provide a solid foundation for the changes.  She describes an exercise that would be the next step in developing this rideability.