Somewhere between the two point position & a full Dressage seat is a very useful position for riding over jumps: the modified, or light three point position. It offers clear advantages in certain situations. First, let’s define the term "Three Point Position."
"Remember, the conversation between you and your horse must never be dull or inert. It should be, 'Ask, receive, give. Ask, receive, give.' Ask with your body and legs; receive through your body into your hands; give primarily with the hands, but also with your body and
Remember that whatever you are used to usually feels right to you. You will often have to step out of your comfort zone if you wish to improve.
“Thoroughbreds tend to thrive on physical movement, and they are, like all horses, hypnotized by their own rhythms. Repetition of success creates a sense of peace.” ~ Steuart Pittman
Your horse's stride can only be as long as his neck is long. So try not to shorten the neck, but rather look for the feeling that your horse is reaching forward into your connection with his head and neck.