I don't know anyone who runs them until they start to hang their head, then jump on them, be they old trainers or newcomers. No doubt different folks do things different ways. I have never lunged a horse for foot work training and honestly Ive never heard it suggested until now. A lot of brushing, grooming, gently rubbing the leg along with soothing talk and patience, leads to picking up the foot, and has always worked for me and has never failed to be accepted in my experience by a Colt or Philly. I do not doubt that a lot of lunging will speed thing up in foot work. Kind of like kids who run, jump, and play at recess will be much more calm and relaxed when they go back to the classroom with the teacher. lol
I agree, building confidence in the trainer by the Colt or Philly is a step by step process. When done correctly will build a solid foundation which will produce good solid dependable gentle horses.
A 'runaway' barn struck older sour horse on the the other hand is outright dangerous, not only to the rider but the horse itself. Lunging has its time and place as well as grooming, and other aspects of gentle, easy patient, training. Knowing 'when' to do 'this or that', or knowing when 'not' to do 'this or that', is the key.....
Phillip