What are some tips for helping your horse not to get to round to the jump? Thanks for your help: )

Lots and lots of flat work to get your horse working from behind and lots and lots of leg.
Do you mean not having your horse collected? I had this problem with my horse and I used a releve bit, which gave me more control and an easier time of finding my distance. Before, I used a pelham and he would pull me forward and I would be unable to find my distances. Hope this helps answer your question!
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