Originally Posted by MHFoundation Quarters
First, welcome to the forum!
To avoid a bit of confusion, a lead is in a canter/lope. At a trot, you post on the "diagonal". The easiest way to remember when you are starting "Rise and fall with the leg on the wall" so you will be up when the outside shoulder is forward.
So true - my variation on this (because I have a simple and easily confused mind) is that your butt is in the air when the inside front leg is on the ground. The inside front leg refers to whichever side of the horse that is closest to the centre of the arena/ring.