I'm a visual learner. I need to be show how to do something in order to do it. When someone explains things as they're doing it, I'm golden. I also love visual clues or reminders for things. No matter how many times my trainer tells me to keep my hands closed, or shorten my reins, it just doesn't stick.
My inability to keep my fingers closed around my reins, especially my left rein, became very apparent in my last lesson. I just could not keep my reins short. I joked with my trainer that I needed to be a pony kid again and break out some rainbow reins to remind me to keep my hand on a certain color and she told me to go for it.
So I swung by the local farm store and picked up a pair or $30. Now I can very easily tell if my left hand has gone rogue and if my reins are even. My current joke is that I'm playing Twister and the prompt is always "Left Hand on Blue". And even after only a few rides with them, I'm finding it easier to keep my left hand where it's supposed to be.