Quiting too Soon

Yesterday, my sister rode Ana, and Ana was getting frustrated with the trot, stop, and back up. She reared. It was a very pretty rear though. After having Ana stop one more time, my sister was done riding. I didn't want her to quit even though she had been riding for two hours already. I told my sister that it would teach Ana that when she was bad she wouldn't have to work. Today my sister rode Ana again, and sure enough in the first fifteen minutes of riding Ana reared. My point was made. Ana learned that if she reared she didn't have to work. Horses are too smart for their own good. It only took Ana one time of getting away with something to try it again.