One of the best things about running is going out in the fields and having the core part of your training somewhere where horses graze. Horses, while not exactly bright, are very interested in what goes on around them, so they'll have a look and then when they see running going on, they'll also start running. It's a fantastic thing to look at, very different from watching them run while they have riders. They always look like they're having a great time with it, and their movements are graceful and effortless, unlike those of most human runners.
Lambs will also get in on the fun and games. Fully-grown sheep always look like they haaaaate being sheep, but the ones that are only a few days old know how to have a good time. So you'll get horses running gracefully in one field, lambs dashing to and fro in little groups in another, mature sheep looking at the lambs worrying if they'll catch scrapie, maybe a few frogs croaking in the ditches - perfect. Absolutely perfect.