Scott Hassler starts this pair out by asking the rider to direct the trot she wants, using a definite post to communicate to her horse.  With consistent, clear riding this youngster relaxes more, and they work on getting him supple in his body with serpentines.  In the canter Scott stresses that the transition to canter isn't done until the horse is through. When they return to the trot Scott makes sure that when he asks her to bring the trot back that the tension does not increase. Scott asks for the stretchy trot and explains why he asked for it at this point. He rushes after the down transition to the trot, and Scott has them slow the tempo a bit.  He really reaches in the stretch trot.