Originally Posted by MyBoyPuck
Please, there's no offense intended here, but it's probably because you're on a nice comfy Quarterhorse or otherwise broad backed breed. My friend used to watch me struggle to sit my high withered TB's horse. She would laugh her butt off while I bounced around like a piece of jello. She let me try out her QH, and I was stupified to find there's almost no movement when he trots. It's night and day. Western riders are very good at sitting back on their pockets and keeping their hip angle open to absorb the motion, so you do have a significant advantage there. If you lock your hips or back, it's all over.
Although there are some QH like your WP lines who have a nice comfy trots when you get into your true performance QH their trots are much bigger and drive much more then what you get from a WP bred trained QH.
I have even ridden friends big dressage horses who they have a hard time sitting the trot on and I have little problem. I just think it is b/c it is what Western riders do.