I suddenly started having problems with my mare standing still while I got up in the saddle. She kept sliding away from me everytime I would start to step up in the stirrup. I thought maybe I was doing something wrong, though I had been getting up in the saddle the same for the last 6 months. When I first got her back from the trainer last fall when she was broke, I never had this problem. So I went online to research it. I found several sites that said to lunge her for about 10 minutes then try to get up. And everytime she moves, lunge her again till she realizes that standing still for mounting lets her rest. I tried it this afternoon and after her sliding away from me three times (we started with a 10 minute session, changing direction several times) and me lunging her for a couple minutes each time, she started standing stock still. She let me stand in the stirrup, lean over her back, just stand there with my foot in the stirrup......you name it and she never even twitched. After I got up in the saddle, we just sat there enjoying the nice weather and watching the birds fly by. Then I would get off, walk her a bit and try it again. And she behaved each time after those first few slide aways. Wow, the things you can find online! I'll keep reminding her in the coming days and weeks and hopefully we have gotten past this particular problem. I HATE it when a horse won't stand still.