When I got Bo I couldnt get on him till I had walked him a mile or so down the trail. Pretty much became our warm up routine. Something I now do with all green to me horses, just walk them out alone get a feel for them. Then I usually ask them nicely not to kill me when I get on. Has worked so far. If I decide to trail ride X route, by god we are doing that route either with me leading or riding. I am not to proud to get off and do a few drills to get the horse to focus on me. When I am doing these walks I don't just plod along. I walk, stop, back up, jog, run walk, send over obstacles, etc.