If it's hunter, the judge isn't judging you. You could ride backwards and it wouldn't matter (or maybe it would--that might be a little extreme!). The key is to ride in a way that best shows off your horse--so you don't want to look sloppy. Also, bad riding will make your horse perform worse. But your horse's movement and appearance is more important than your own.
In a hunter class, the judge wants a horse that moves out with impulsion, using the hind end, with a level/slightly elevated topline (no giraffes, but no pleasure horses either in a hunter class). The nose should be at or slightly in front of the vertical. The horse should accept rein contact and soften to the rider's hands. He should move with a long, straight stride and track straight along the rail--no weaving. He should be consistent, maintaining the same pace throughout the class. He should be very attentive, not getting distracted when passing others or at certain spots. During transitions, he should respond immediately without changing his frame or attitude--just his gait. If asked to stop and stand, he should stand quietly and not fidget. His gaits (walk and trot) should be rhythmic and cadenced. He shouldn't be fast and rushed, but not slow and pokey either--a good, natural rhythm that looks "easy" and forward.
In a hunter class, the judge wants a horse that moves out with impulsion, using the hind end, with a level/slightly elevated topline (no giraffes, but no pleasure horses either in a hunter class). The nose should be at or slightly in front of the vertical. The horse should accept rein contact and soften to the rider's hands. He should move with a long, straight stride and track straight along the rail--no weaving. He should be consistent, maintaining the same pace throughout the class. He should be very attentive, not getting distracted when passing others or at certain spots. During transitions, he should respond immediately without changing his frame or attitude--just his gait. If asked to stop and stand, he should stand quietly and not fidget. His gaits (walk and trot) should be rhythmic and cadenced. He shouldn't be fast and rushed, but not slow and pokey either--a good, natural rhythm that looks "easy" and forward.