My mare is an amazing jumper but she is really big so I have trouble keeping a good time while competing. She is very big for short curves and if I gallop too much I do a fault. Any tips?

Make her learn how to rock back on her hocks but also go forward. My horse goes really fast and it can be difficult to for through the small turns but what I did was really work in collecting after and then letting him go
Work on getting her collected so she becomes easier to turn. Getting her to rock back on her hindquarters in a shorter canter.
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