Aids
Parts of the rider's body that are used to communicate with the horse eg legs, seat, hands, voice.

Canter Lead
Reference to which leg the horse throws further foward in the canter eg left lead is when the horse throws the left leg further forward than the right leg when cantering.

Contact
The tension in the reins which allows the rider to feel the horse's mouth.

Diagonal
Reference to the horse moving its leg in diagonal pairs whilst trotting.

Downward Transition
Moving down a pace - eg from canter to trot, trot to walk.

Gait
A pace, eg walk, trot, canter.

Inside
The side nearest to the inside of the school, arena or circle eg "inside leg" is the leg nearest to the centre of the school, arena or circle.

Near side
The left side of horse and rider whilst riding.

Off side
The right side of horse and rider whilst riding.

Outside
The side nearest to the outside of the school, arena or circle eg "outside leg" is the leg nearest the outside of the school, arena or circle.

Upward Transition
Moving up a pace - eg from walk to trot, trot to canter.