Lateral suppleness is the horse's ability to bend easily from side to side. Few horses are naturally ambidextrous, so a major goal of dressage is to make the horse more even on both sides & truly straight. Here are specific exercises to improve lateral suppleness, from most basic to most difficult!
"Riding is, therefore, an ongoing, never-ending, challenging process. That aspect makes riding so intelligent and significant an effort. One merely strives, never arrives." ~ Charles de Kunffy
"If the rider encounters a problem, he must first look for the cause in himself. Most of the time, the rider is the cause of the problem. Only someone who looks at his own riding critically and is willing to improve constantly and learn more will be a good
Your balance and the strength of your core are what allow your position to be unaffected by your horse's changes of speed.
"The quality of a good canter: round, energetic, straight, cadenced, light. You have to feel in the strike off that the horse lifts his forehand without throwing himself forward." ~ Nuno Oliveira