I have a 10 year old QH mare. She is a left brain introvert and is very lazy. She is also very stiff. I have been trying to do lateral and vertical flexsion on the ground and in the saddle but she is still always stiff. Because of this when I get on her and make her go forward she will turn left and when I pick up the right rein to direct her to the right she doesnt give her head and therefore does not turn right. Any exercises that help with making a horse supple or responding better to the direct and indirect rein would be appreciated!