There are many critical considerations. The ones listed below are some of the aspects which, if ignored, could result in an accident.
Adequate experience means several seasons lunging many horses under varied situations.
While it is possible to hand a lunge-line to a less experienced instructor with a horse that is gentle and experienced on the lunge, it is not advisable. It is preferable to have an experienced lunging instructor. With an instructor experienced in lunging and in teaching lunge lessons, the safety of the lunge lesson is greatly enhanced. The lunge horse must be extremely gentle and quiet, well-trained for lunging, not prone to spook, reliably trained to the voice, and not afraid of the whip, which is required equipment. The lunge horse should not spook if the instructor stoops to pick up a whip.