Seems to me that a part of the Monte Foreman designed stirrups, was the fact that they could be adjusted forward or back, to suit the rider in getting aligned. They sure were “free-swinging” in that you could put boots on point of horse shoulder and up behind the skirts if you wanted to.
The only pictures I could find of the adjustment system, were here. The last two photos of saddle upside down, and with the girthing system, show the three parts of fender straps I remember. And the slots of the locking device, key?, that made no thickness under your legs.
http://www.horseclicks.com/monte_foreman_balanced_ride_saddle/saddles/341008
I am not clear on that, but there were two places to set your stirrups for your personal “fit” in those Monte Foreman Balanced Ride saddles. You were NOT forced into a chair seat unless you didn’t set your stirrups correctly. Posture was expected to be like any other riding, with head, hips, heels aligned as you sat there. If you were doing other, faster gaits, body would naturally shift to keep you in balance, free-swinging stirrups ALLOWED your legs to go where they needed to be.
It was pretty radical thinking back then, being aligned, getting leads AS REQUESTED! Way out of the box for us eager students trying to improve ourselves and skills of our horses. Heck a common belief was that a Reining horse only had a specific amount of stops in him! Once you used up his number, he wasn’t going to be a good stopper anymore!! Monte was the beginning of my “higher expectations” attitude in horse training. Can’t get better if you don’t “expect” it of your horse.