There is an imaginary "home position" for your hands when you are riding. That is just above (and centered over) your horse's withers, with your hands about the width of your bit apart. If you have to deviate from this position for any reason, make sure you get back to it as quickly as possible.
In the sport of Eventing, ensuring that our horses are truly fit for our level of competition is one of the best ways to prevent unnecessary injuries.
Horses become incapable of learning when they go past a certain level of fear, anxiety, or stress. This means that if you keep hammering away at the horse, trying to teach them something when they are currently overwhelmed with stress, it will not work.
For the horse, the learning happens on the release of the aid. That means if you don't release the aid, the horse will not learn.
"Don't take the tempo down without revving the engine." ~ Chris Bartle