One of the most misused "techniques" I have found is how people present asking the horse to move around a circle.
Whether it is for lunging, groundwork, riding one, or otherwise, rarely have I witnessed horses thinking and traveling around a circle in an intentional, soft manner.
Often there is a degree of "driving" energy from the human, along with containment via the lead rope, lunge line, reins, the rider's outside leg, etc.
