Yeah I know. But an okay example of what in-hand will look like. Explaining in-hand over the computer is tough. lol
So, Zix, you can see the ability of lateral movement when done on the ground. The first thing I would say you should start with is teaching him to yield his hind away from you with a gentle touch of your whip. You will stand at his head, facing his hind. If you're on his left side your left hand will hold the rein directly under the bit, on the buckle. Your right hand will be holding the outside rein. When you use either side of the bit, you will pull down. The inside rein can sometimes be pulled in different ways depending on the answers your horse gives you.
You will take a gentle feel on the outside rein at the same time you tap her hind end over a step. Release the outside rein immediately once she has moved over. The inside rein just keeps the bend and the softness in her jaw. Try not to hold her in any position with your reins, just put her where you want and then release. If she comes out of it, just fix it. Don't hold.
Once you can move her hind end over with the tap of your whip on both sides you can then teach her to yield her shoulders away. To do this, you simply turn and face her. You'll be walking into her throat latch area.
Take a feel on the outside rein, inside rein keeps her bent towards you only a little. Your outside rein tells her to go that way, and you walking into her so to speak tells her to yield over. You can push on her shoulder with the butt of the whip if you need to, or your finger.
You want to get the sensation that she rocks back, then moves her shoulder away from you. If you feel her push forward into the rein or your space abort the shoulder yielding and back her up a step or two, then try again. Be as gentle as you can in the reins. In the in-hand work less is more, its just timing and feel.
Once you can move her shoulders easily and keeping her balance back you can start to alternate from pushing her hind, then her shoulders, then her front, then her hind. Always making sure that she is not pushing down into the reins, pushing forward, that she stays nicely balances between both reins. Also make sure that her head and neck remain in line with the rest of her body. Yes there will be times where she is bent, but her neck still needs to remain centered so that her balance doesn't dump off one shoulder or the other.
Once you can alternate from the back to the shoulders, both sides, you can start to influence the complete yield sideways.
You will still be facing towards the back as you take a feel on the outside rein as you cue her to step sideways. Your outside rein is the rein that blocks the forward movement and allows the hind leg to cross over as she moves sideways. In the beginning just ask for a step or two if sideways then stop and pat her. If she pushes forward, back her up a step. If she backs up, cue her forward. As I said before, it is not about holding her in any position or movement. It is putting her there, directing her there, and then to keep fixing will teach her to hold herself and carry herself. It will make her lighter. And you will be able to keep her balance in check easier.
As you go to move her sideways and her hind end is leading the dance, then you need to walk more into her so her shoulders can catch up. If her shoulders are leading and her hind end is slow, hold a bit on the outside rein and touch her hind end over to keep up. You will know when you have a balanced yielding if her legs move in a diagonal manner. So her inside leg and outside front will move over simultaneously and her inside front and outside will move simultaneously.
Whew. Let me know if any of that made no sense. It really is an important thing, in-hand, so have fun exploring it and seeing what you can do. :)
In riding, a horse's energy is like a river- guided by the banks but not stopped by them.