What am I doing wrong? My mare halts square at the sides on the arena, however do it down the centre line and she swings her quarters? I am clearly doing something wrong and it is not just one side she swings to.
Sounds like a straightness problem...if that's not stating the obvious?!
Make sure you have even contact and even legs coming in to the halt. Look up, keep seat even and body straight.
Perhaps you could try halting between 2 poles either side of centre line? To give you something to aim for then take poles away. Just pulled that out of my ar*e...not a tried and trusted training method
She halts square at the sides as the fence or side of school is there to support her, on the centre line she doesn't have this support.
She needs to be more in front of the leg and connected. If your riding two legs into two reins with a true connection you will be able to keep her straight and remember to use your legs into the halt, so you keep the hind legs stepping up into it.
I think I probably do need to sit up more and hold her into a contact more using seat, stomach and legs. Have dressage lesson Fri so think I may get a bit of abusing there
Make sure you are riding her forward to halt, not pulling her back to halt, that way she should halt straighter. Also try some shoulder in so if you can feel her quarters swinging one way as you ride up the centre line, try to ride shoulder in that way to straighten her into the halt. You won't actually halt in shoulder in, but the effect will mean she'll be straighter.
Try as has been said using your legs to make her move forwrds into the halt, but also instead of pulling back on the rein just lift your hands slightly, this is effective even on the worst pullers. Also don't get too hung up on your weaknesses try to improve the things you are good at!
I find with the sensitive warmblood I ride, that less is more when it comes to centre lines.
I just try to make sure I'm sitting square to the front with even weight on my seat bones and that I'm just riding forward looking at C. Make sure your not anticipating the swing out and trying to put leg/weight on that side. With Dragon if I do that he swings into the side I'm trying to correct with.
Just think, look up, look forward, sit straight and relax into the halt closing your legs on evenly as you do