OK, now what does THAT mean?
LOL, this is where I test myself...Trot is a pace of two time, with the near fore and off hind moving together, then the off fore and near hind.
When you ride, start counting, the walk 1 - 2 - 3 - 4, 4 distinct foot falls.
trot, 1 -2, 1-2 two distinct beats, and that is how we set out posting 1 - 2, 1 - 2 up down, up down.
Canter or lope is a 3 time, 1 - 2 - 3, 1- 2 - 3,
Gallop, back to 4 time again.
Ok back to out trot, 1 - 2, 1 - 2 , each time the diagonal pairs of legs moving together, front left with back right, front right with back left. Now posting up and down affects the horse, so we try and balance out how we post,
The saying is, “Rise and fall with the leg on the wall,” and that’s referring to the front outside leg. So, if you were trotting around the arena to the right, you’d rise as the left front leg moved forward. But the reason you do so has to do with the hind legs. Because the trot is a diagonal gait
, as the left front leg moves forward, so does the right hind leg. Going in a circle or around an arena fence, the inside leg bears more weight, because of how the horse’s body is arced. So by lifting your weight out of the saddle as that hind leg bears weight, you’re relieving the horse of extra pressure.
Even if you’re trotting in a straight line, say for several miles, you’d want to alternate your posting diagonal so that the horse’s haunches are being worked equally. Read more here The Importance of the Posting Trot
It is a good exercise to ride with eyes shut and start to learn to feel which leg is hitting the ground, it is fun and starts you thinking about the horses whole body..