Horse health and physiology shape how a racehorse moves, breathes, focuses, and recovers. This glossary section breaks down the essentials—lameness grades, fitness and conditioning, mental toughness, paddock appearance, recovery cues, and common pre-race exam outcomes—so you can recognize real signals without guesswork. We keep it practical and welfare-first: what vets and officials look for, how issues show up in work tabs and race spacing, and what’s reasonable to infer on race day.