What lungeing equipment?

[spotty_pony]

What lungeing equipment should I use to encourage my horse to work long and low and to stretch across his back? I have been reading about Lauffer/Vienna reins and wondered if any of you had any experience with using these or could suggest anything else?

He tends to get tight through his back and drop behind the bit so I want to encourage him to move forwards into the contact and relax and loosen through his back.

Any advice much appreciated.

 

[Littlelegs]

For long & low I prefer to lunge with just a cavesson, if necessary though a chambon for re training.