My horse used to pick up the right lead all the time, and last week she decided that when we are going to the right she would like to pick up the left lead all the time. She is being such a jerk about it.
I will be sitting back, hands up, eyes up, outside leg back, and she'll still pick up the wrong lead. If she doesnt ill bring her right back into trot agian, and collect and ask. And I have been only asking out of corners.
The only way she'll get it is if you are coming out of a corner onto a tight circle, or she'll get it out of the corner if you're lucky.