Lunging a hot horse can sometimes get you into major trouble. It’s a small circle and puts a lot of stress on their ligaments … if they are really cranked you have no decent way to stop them unless they are in side reins with a lunging caveson or bit and bridle and then you will have to hammer (jerk their head) on them to get their attention or pull them off balance … none of those things help a hot sensitive horse calm down.
Teaching them “habitual calmness” goes a whole lot further.
With most horses I work on the walk … in hand or riding … especially riding if you can get on without too much fuss. If they get nervous while you are in the saddle, go to a shoulder fore or shoulder in or any variation of that even if it isn’t perfect … just keep it soft with a slight bend. A lot of times I will only have contact with the inside bending rein and I let the other rein hang loose on the outside … that way they are absolutely not put into a “vice” by accident with your hands. They will usually reach down into the contact rein.
You will need to have a good seat and hands … hands need to follow the horse and not get in their way … soft following light contact.
I free lunge sometimes in a smallish arena … I walk next to my horse … if they are really crazy … use a halter and lead line or lunge line … walk with them enough that they get into “lock step” with you …
Almost all of my schooling work involves 50% walking … we learn to walk everywhere. It puts a very good foundation of long slow conditioning on them also … much better foundation to build from as you begin to add distance and increase in gait (trot canter gallop).
I don’t know about anybody else, but I talk to my horses … not always, but a lot of the time, especially when they get nervous or worried … except during a dressage test.
I have had several horses that talking to them brings them right back to me.
I’ve got one now that when he hears gunfire he jumps … but the minute I tell him it’s ok, he calms immediately. I jump when I hear certain types of gunfire because it can be very loud … I tell the horse it’s ok and he will be rock solid even if I tense up … can’t beat that, and he is a very hot horse … like an anglo arab.
I do a fair amount of work at liberty with them and see how hot they can get … I want to bring their attention to me … I might even use treats at first …
“Slow down”, “whoa” and “stop” are major words in our vocabulary. I use a noise like a first part of a whoa … and sometimes I use it to set the rhythm.