Ok, that's an exaggeration, mostly I have trouble at the gallop. I start out fine but after several strides I have to really work at keeping my rear in the saddle and I invariably lose my stirrups--I can pick them up again but I just can't keep them where they belong, like under my feet. My seat is pretty solid and I have good balance on the whole, so I don't worry about falling off, but I feel like a sack of potatoes at the gallop, it's ridiculous. I've been trail-riding for years and I've had this problem forever. I would like to ride a proper gallop sometime before I die. I know it's hard without seeing me, but does anyone have any all-purpose pointers I might be able to try out next time we ride?