Join Date: Feb 2013
Location: In the wonderful state of TN!!
just remember this "rise and fall with the leg on the wall" meaning whatever leg is closest to the rail of the arena is the leg you go with.
As for being able to tell what leg is moving, take a white marker and draw a line following your horses shoulder bone. Just practice watching the lines move and seeing which shoulder is on the rail. Whatever leg you're suppose to be posting to the line will move forward. That's when you rise. When it moves back down that's when you fall.
And as you are posting, concentrate on the movement of the horse. Really key in on his stride and movement and you'll be able to tell which shoulder you should be posting to.
And you can do an exercise with someon who knows their diagnols. Ask your horse to trot and without looking down, call out if you think you are on the right diagnol or not. The person on the ground will tell you yes or no. Give yourself three strides to determine. And yes being on the correct diagnol does matter because it helps the horse balance through turns. And you will be able to tell in a turn if you are on the correct one because if you're not its going to feel really jagged like you're going against the horse.
It takes practice but once you get good at it, you'll be able to tell what diagnol he will go into from a walk and even what lead he will go into from a trot.