TIPS AND PITFALLS:
Bear in mind that you don’t have to keep the movement for the entire length of the arena, but aim for a few good steps then come round and try again.
Try not to have too little or too much bend. Make sure you provide enough outside rein contact and don’t have too much inside rein tension, as this causes too much bend in the neck.
Don’t make the angle to the inside track too sharp as this then almost becomes a leg-yield. The angle should be about half that of the shoulder-in, so 15°.
If the hindquarters drift out, your thigh, knee and lower leg are not supporting the horse enough. Check your outside leg is positioned correctly behind the girth and against the side of your horse.
If the horse is young or green, then this form of exercise will initially take a lot of energy and brainpower so take walk breaks in between.