Ok so done all the ground work and taken it slow on this 4 year old warmblood mare. I have trained a lot of horses but this one is my biggest challenge. You cant read this horse shes calm and then out of nowhere she spooks I was bucked of when i tried to mount her, she seemed ready, calm and responsive everything was good and then soon as i go to put my leg over her back BOOM she explodes. Just want some tips or advice