Thanks for the answer Kate!
Before I jump my horses, I like to do a lot of transitions with them, so I know they are listening to me. My favorite exercises to do with them are walk to trot and trot to canter transitions. As a cool down routine, I trot my horses in a circle and gradually give them more rein, so they can stretch their necks, then I collect my reins to make sure they are still listening. Hope this helps to answer your question.