My instructor would like me to ride with very short reins, elbows in front of body and hands well in front of withers. I find this position tips my upper body forward and my legs back and just doesn't work for me. I was originally taught to have elbows as part of upper body and straight line from elbow to bit. I have tried to explain my point but she just asked me to sit back. How I don't know. Makes no sense to me. How do you go about something like this with an instructor?