Centuries ago, Sir Isaac Newton said that a body in motion tends to stay in motion, while a body at rest tends to stay at rest (yes, I just channeled my inner “Big Bang Theory” science geek for that one!). And in a lot of ways, many veterinarians are preaching something very similar to owners of relatively sound senior horses: One of the best ways to help maintain such a horse is to keep him in regular exercise. Think about it: If you keep his aging joints moving, they’re likely to keep moving. If you let his joints “rest” for too long, there’s a good chance they’ll get creakier.