My mother insisted that I do it when I was returning to riding after back surgery. I never felt good about doing it onto a normal mounting block- such a teeny little target and one step from the horse and it's all over... probably with a slip/fall that was worse than just dismounting normally in the first place. (landed on the edge of one once and flipped it. If my mom hadn't been there holding the horse and managed to catch me, my surgeon would have probably murdered me for it...)
The way that actually worked was to stack a few straw bales. Larger target to step down onto. Jsut have to stack them good and tight so they don't wiggle.
One barn that I audited a couple of clinics at had one that would make it really easy- it was a proper solid platform for mounting/dismounting...
After I messed up my shoulder I had to use a mounting block to dismount because it was too painful to hop off the normal way. My barn had built a large mounting block that I would step off on to. When I changed barns I built my own mounting block and made it high enough that I can drop my stirrups and step right on to it. Teach your horse to stand first. Then have a ground person to hold the horse while you get on and off the first couple of times. I use treats after I'm on and settled and when I get off. My horse learned very fast that the only way I was getting off was by using the mounting block. When he is tired or done for the day he tries to edge over to it and will position himself right next to it if I let him. After he got good with it I went back to alternating using the mounting block or just swinging down the normal way. On days my knee is really stiff it's nice to be able to just step off on it.
I so hear you! First he has to learn to STAND. I've seen a mounting block that was more of a platform on both sides. The horse stood in the middle
so could not swing sideways just as you are aiming for the boards.
I mostly slide down slowly because my mare stands like a rock, but my saddle scratched from my breeches' zipper.
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At home I use a tree stump and we spent a couple of days working with the pony, my DH there to hold and plenty of treats. He got very good at it very quickly and doesn't care which side you get on or off.
At the barn we worked on a standard three step but it's a smaller target than the stump and can be rocky. I did an experiment to see for sure how well his training is sticking and he is just a little too impatient if he has been out 24/7 but unridden for a couple of weeks, he wants to GO.