Well considering TBs are normally mounted while they are in motion...it makes sense that she doesn't understand that want her to be still; she's just been taught to be moving while the rider mounts, or shall I say that if they move, they just hoist the jockey up there anyway.
What you need to do is create a circumtance in which "stand still' is clear for her. The way I train or retrain a horse to stand at the mounting block is to do 1 of 2 different exercises to teach him that you want him to be still while you mount. Either way is effective, and retrains the mind of the horse to not anticipate the mounting, so he learns to stand still.
1. Lead horse up to block, lining her up to it like as if you are going to mount, ask her to stop, and stand there for a few seconds, then walk away with her, maybe do a bit of backing, or hip yielding, so she isn't "just" walking around on the lead. Keep doing this over and over, progressively adding more time to your 'expectation' of her to stand still. Once she will walk up to the block and stand there with you in a normal leading position, then start asking her to stop, then step up onto the mounting block, and the retreat once more...eventually you will get to a point where you will get on the mounting block, fuss with the saddle, pat her all over her body (while on block), and step off and walk away again. Once she has that down, then get on block, put a foot in stirrup, and retreat...and so on and so forth, until she stands there for you to get on, quietly and calmly. This may take one lesson, or several. I would most certainly work on this AFTER she has had some groundwork to get her mind 'working'; she also won't have all that extra energy, that she would have if you saddled and went straight to mounting practice.
2. This method I have found to be the quicker one, as horses are naturally 'lazy' and will prefer to stand than have to work. Make sure she knows how to send and lunge well, though, as that will be the working techniques you will mainly use, although I will incorporate hip and shoulder yielding, backing, etc, as well. Set mounting block roughly 5-6 ft away from a fence, and lead her up to the block (she will be "sandwiched" between you and fence.)...when you get her there, stand next to the block, and start sending her back and forth between you and mounting block. After several repetitions of sending, bring her to a halt next to the block, just as you would if you were to lead her up to it to mount. She may be crooked the first bunch of times, but that's okay...you are just teaching her "where" to stop and stand. Let her rest there for a few moments, and retreat away from the block all together; Do some lunging away from the block, you and also work on yielding exercises as well, but mainly you want her feet to be moving really well. When you have worked her a bit, bring her back to the block, and this time stand on it while you send her back and forth, and once again after several repetitions, bring her to a halt next to the block. Let her rest there while you pat her neck, and all over her body on that side. After a little rest, retreat, and resume more lunging and yielding. Return to block and do what you did before, standing on the block, and sending her, and bringing her to a halt next to block; rub all over, let her rest, retreat. Once she is solid on that, then start putting a foot up to the stirrup, retreat, repeat, and so on...until you can mount and dismount without her moving about. Again, may take one session or several.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."
Last edited by mom2pride; 11-18-2010 at 11:16 PM.