Denny noted that this rider did not school the extended trot. The decision to sell has to be based on no emotion. He had the rider send the horse forward then bring the horse back at all three gaits. He used transitions to redefine the aids. A horse must be supple in both directions before it can be straight.
Collection is forward energy channeled upward.
Corners are made to be used, otherwise the arenas would be ovals. At the FEI Levels, one needs rideability, which requires the refinement of aids. As Denny schooled this horse in preparation, the auditors could see the improvement in the quality of the horse's gaits and movements. Hokan Thorn, riding Jennifer Brinkley's Bas, warmed up as the auditors watched. He rode the Grand Prix, then immediately rode the Musical Kur.