I come out of the gaited world. It’s well known there that a laterally gaited horse will perform the most dramatic gait while ridden in contact and sometimes very frank contact. The horse will use the bit to balance against. I’m not fully understanding the bio-mechanics of this but it’s really obvious if you watch such a horse correctly ridden. This does not work so well with a diagonally gaited horse. It does not work at all with bosals, hackemores, side-pulls, and (presumably) “bitless bridles.”
The gaited world, and most especially the laterally gaited world, also emphasizes the hand and the heel. The rest of the body, no so much. This is, in fact, a serious problem as it leads to grossly overbitting for “control” and lots of spurring to attain “impulsion.” I was trained to do this and did for a few years until I learned better.
When my gelding was a bit younger he went through a stage where he had trouble keeping his feet “straight” and would get “tanglefooted.” It’s not uncommon for young horses to do this. As he matured the tendency went away. During this time the hand was there, through the bit, to give him something to “lean” on and regain his balance and composure. I didn’t “pull” him up I gave him something to lean on while he pulled himself back to “center.” I’ve been riding him in a Myler Pelham with a comfort mouthpiece. Usually I just ride the snaffle; from time to time I’ll add the second set of reins as that permits a higher level of precision in some tasks. I’m toying with using a double bridle with bit and bradoon over the next year to see how that might work.
Bits are communication devices, not control devices. I’ve personally witnessed a Walker ride through a Walking Horse bit as described above and almost run away with his rider. The rider had NO lateral control with that bit and used a fence corner to stop. A snaffle bit is like an AM radio, usable in most circumstances but subject to being overridden by events… A curb is like an FM radio, more clear and easily heard and less subject to “atmospherics.” Bitless devices are like tin can telephones, useful under the right circumstances to access training that is there but of very limited utility in putting training there.
This discussion of bits does not mean we stop using balance, seat, and leg!!! In WAY too many of these discussions folks get lost in the defense of some device to the point they lose sight of the fact that you have to ride the whole horse, not just the head (or any other discrete part).
G.