I just bought an 11 year old gelding who has been used as one of those tourist trail riding horses his whole life until he went to my friend for one year. Now I have him. He is healthy but problem is when I ask for the trot he only trots for a few paces until he slows down. I was told this is due to the fact he is use to following the horse ahead of him and only trotted to "catch up". Now when I asked for the canter he seemed so confused I felt bad for him! He eventually cantered after a lot of leg pressure and "kissy noises". But he only cantered for a few strides before walking again. What's the best way to re-train him to trot/canter on cue and for more than just a few strides?