Originally Posted by riccil0ve
Quit gripping with your legs. If you lock any of your leg muscles, it will lock your hip, and therefore stop it from moving with the horse. Your legs need to be relaxed, and lean back. You'll feel like your leaning a lot further than you are, but you probably aren't leaning back enough. =] Imagine you are doing sit-ups, but instead of your upper body moving to meet your lower body, allow your tummy to crunch and let your lower body come up to meet your upper body.
I agree...gripping too tightly with the legs and being stiff, intentionally or because of nervousness, tension, or 'thinking too much', is the absolute enemy of being comfortable on a horse, regardless of the gait....and it's made worse because people are told, and therefore anticipate,
that sitting the trot will be hard.
I like the sit-ups analogy, and have also suggested thinking like you're in a rocking chair...letting your hips roll with the horse's movement.
Relax, shut of the 'thinking' part of your brain, let your body react to the horse's movements, and....have fun.