Any tips for keeping seat still while horse riding?

I have been riding for a little over a year and a half and my seat was fine for a long time, but now (only while cantering) my seat has been out of control. I ride english by the way. I don t really get tossed around by the saddle i just pop out of it and recently you can actually hear the clap of when my butt hits... show more I have been riding for a little over a year and a half and my seat was fine for a long time, but now (only while cantering) my seat has been out of control. I ride english by the way. I don t really get tossed around by the saddle i just pop out of it and recently you can actually hear the clap of when my butt hits the saddle. I try and steady it but i am not very heavy, especially for my age, so that makes it even harder. Any tips on how to sit better would be wonderful! Also if i could do anything at home to help since i don t have a horse of my own! Thank you!
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