For the leg yield: You want to work on turn on the haunches/forehand first, so leg asking to move over won't be so foreign to Jarred. If you have an arena, the wall is your best friend to start teaching leg yields. You want to walk towards a wall, and instead of turning the corner, keep walking to the wall and let the wall stop the forward motion of your horse. Keep momentum up though, and ask him to transfer the motion from going forwards to sideways as he moves away form your leg. I would start out with a full sidepass going perpendicular to the wall, then gradually lessen the angle so you have more of a leg yield going down the wall. Just ask for a few steps at a time, and reward good behavior with lots of praise. You can incrase the length of sidepass/leg yield as he starts to understand what you want.
Once you have him moving nicely at a full sidepass, you can decrease the angle to about a 45 degree angle from the wall and get him moving one step sideways, one step forwards.
Finally, you can start bringing it to the center line, or a quarter line to start. Start at A, and walk in a straight line towards C.. but as you get to D, start asking him to move away from your inside leg to either H or M. Make sure you're not pulling him with your rein; you want to just invite him to keep a nice inside bend.. but make sure to keep the outside rein solid. When training this, just do a few good steps of leg yield, then reward him by letting him walk forwards to the end of the arena - keep him straight, don't let him veer off to the rail again. You can start adding more and more steps as he gets used to it.
You want to keep forward motion
- I can't stress this enough!!! Too much I see a horse fall into a western jog and just sidle away from the leg - no! It should be a solid working trot, where you're taking one step over, one step forward, etc. Do NOT let your horse rush back to the rail.
Another thing, you want to keep the horse straight, don't let him lead with either his hindquarter or shoulders - to correct leading with either, do a small counterbend, and then ask for the leg yield again.
Example: You want to do a leg yield from D to H. Starting from A, you're going to flex him right keep the left rein pretty solid. Just before D, ask him to move away from your right leg. Keep the outside rein solid, but make sure you don't overflex him to the right and try pulling him to get him to move over. Keep riding forward with your seat, and don't let him slow down.. one step over, one step forwards. You can correct with your outside aids if he starts over bending to move sideways faster.
Shoulder in: do a 10m circle in your corner, and get him bending to the inside and moving his haunches away from your leg. Once he is nice and supple, keep the bend as if you're going to start another circle, but as his outside shoulder is about 45 degrees , ask him to keep the bend, but move away from your inside leg and move down the track. Your bend should be such that you should be able to strengthen your outside aids and do a diagonal across the arena.
Just make him do a few steps at a time, and finally increase it so you can get halfway down the track, then let him just walk/trot on. When you finally get to the point where you can do the whole longside, throw a circle in at B or E to rebalance, then you can build up to doing the whole longside.
Now you've got your start! Now you can decrease the angle and make a 3-track, as this is all the angle you need to do a shoulder-in. That is, when you look at the horse doing a shoulder in, you should only see the forelegs, and outside hind, as the inside hind matches the track of the outside forehand.
Um, I hope I made sense? If you want to ask specific questions about anything please ask!
Edit: I thought it might be helpful to add a few critiques of videos:
Leg Yield: http://youtube.com/watch?v=4h8dvJhggVA
- gorgeous.. the hose isn't overbent, and keeps a nice straight line through the whole leg yield. The circle in the middle is a good idea as well, it helps to rebalance. http://youtube.com/watch?v=2KT-TcbhG9k
- this horse gets above the bit, and this is where she lost the contact... the horse does continue laterally, however he is leading with his shoulder. http://youtube.com/watch?v=PrnjKE-5dBg
- good. And a good distance to start. http://youtube.com/watch?v=P8_J5M-xzUw
- bent the wrong way... also leading with hindquarter most of the way, although it's a very good start.
- good, might become a 4-track at times. http://youtube.com/watch?v=-Czq_qhEQ1k
(0:00 to 0:18 ) - a good start to the shoulder in, but it's very exaggerated. http://youtube.com/watch?v=Fz-7qUpoLic
- a little exaggerated at points, but certainly not terrible. Neck is a tad too bent for my liking - make sure you're keeping a nice bend, and not over flexing.
To prevent over-bending or rushing in either one, exaggerate your outside aids for a split second to get him to straighten up, or try a small counterbend for a few strides.
Deb, this goes against what you say, but you MUST have outside aids on the horse to keep it doing the movement properly and not over-flexing.