With my barrel horse I always do everything slow about 30 mins of just walking sometimes. I alway love going back to basics and working on equation and keeping my horses gaits nice and smooth working on basic walk to trot transitions seems to help cool my horse down. If working for my barrel pattern I working with tires sometimes it is awesome. I throw down 4 tires (you can use cones or even poles; but I prefer tires because they are about the same size of a barrel) put the tires into a 4 cornered square an practice bending and turning, halting my horse before taking a turn. It helps to take barrels out of the picture for my barrel horse and the tires are about the same cirrcuference so my turns don't get messed up. Also just having some fun with your barrel horse can help de-stress them I love to get of my horse sometime and do running racing on the ground and build some team bonding with you mount. Hope this helps and happy racing!