Tied up, presumably facing a blank wall, doing nothing. It isn't a natural state for a horse. They are designed to wander around, eating, socializing etc. She is just bored. I've got things down to quite a fine art in my catching & tacking up routine so there is minimal standing around for the horse. Nicer way to start the ride than with him/her bored and me annoyed/hassled/telling off. I don't want a brain-dead animal who just stares at walls Enjoy your live-wire too!
we tie up in middle of yard, so theres stables in front and behind, so she was facing another horse, but she only seem's to do this when im grooming and tacking up, i guessed it was probably impatience and a bit of come on lets go about it, but was checking to see incase someone said maybe its this or that....