A race horse is an athlete and is subject to injuries that can limit its performance. Examining a racing form to see how a horse has performed over its last dozen races can tell bettors how often a horse runs and when it last ran. When a gap of several months appears in the recent results, the horse likely has suffered injury or illness and might not be in the best of condition. Such horses might start out strong but fade toward the end of a race when it begins to tire out. Running a horse too much also might indicate poor fitness. A horse that races nearly every week might be run too much and could be more prone to injuries and ailments that can sap their performance.