You never walk in side reins it can cause a lateral walk.
Side reins do not kill and maim horses. People using side reins incorrectly kill and main horses.
Lunging in sidereins is a skill and you go up the levels the same as in dressage. It is also just as fascinating as riding and is not boring to horse or rider.
There is no point lunging without side reins, you are just running a horse around at the end of a rope.
You must be taught how to lunge a horse correctly.
You do not lunge for long. The saying is ‘10 minutes of lunging is equal to an hour of riding.’
The horse should be responsive to voice aids and be able to walk, trot and canter quietly on command without them.
You always warm up without side reins. You always put the reins on extra loose as the horse must always go forward in side reins, they must never take even one step backwards. You put them on loose to make sure they are thinking forward and that they have not got a grass seed or something in their gum overnight that will affect them wanting to go forward that was not seen whilst grooming.
Once the reins are on. Halt to trot transitions only. No walk. Changing direction is a form of reward. You want quality not quantity. The horse should stay in each gait without the whip.
You must take the reins off and walk both ways after lunging. Other wise instead of having a calm horse that will walk on the lunge. You have one that will always go straight to trot and that is the fault of the lunger.
I never use and refuse to use and will never ever use elasticized side reins. They can teach a horse to pull and lean. I cut the donuts off and turn them into solid side reins. JMHO.
The reins are too tight there should never be a pull on the horse from the reins. They should not be used to pull a horse’s head in. The side reins should not pull on the bit. The release comes when the horse gives to the side reins from going forward into the side reins.
You need to be taught correctly. If you were taught to do this find someone else to learn from.
Yes my horses are stretching right down in the side reins. The stretching down and then coming up to work is changed by the lunger not the length of the reins. I can take them from stretch to working to stretch again. I do this with my body not the reins.
Horses learn fast. Do not make the mistake of thinking you need to shorten the reins to teach them. You keep them at a length longer than most people use and the horse will learn. Nothing the first day nothing the second day. An inkling the 3rd day and you build from there. They can be taught contact not under saddle.
The more advanced the lunging horse, the higher the side reins are placed. The more advanced a riding horse the higher the hands are held.
Horses lunged correctly have correct muscling and a quiet mind and are a Joy to ride. If lunged incorrectly they are frantic, work the incorrect muscles and can go over backwards and kill themselves.
All the above is the fault of the lunger. Not the side reins, even when solid ones are used.