Learning to travel in a soft frame under saddle
Few horses have had the benefit of sufficient bridle work on the ground. We tend to do a lot with the horse on his left - tack up, lead and mount but often not much at all on his right side. This often means that the horse has become desensitised to pressure/cues on his left. When you first start teaching 'give to the bit', softness in the bridle and self-carriage from the ground, you may well find that the horse is much better (more responsive) on his off side because this is your blank canvass. It takes a lot longer to un-train and then re-train, if your horse has been taught to put up with pressure in the bridle for example, than it does to simply train what you want in the beginning. This is worth remembering if you feel your horse is one-sided. Is he really one-sided or are you un-training a well-learned response?
The un-started horse will be similar on both sides