What makes a Kentucky Derby champion? Big hearts, immense lungs and powerful legs

LOUISVILLE, Ky. (AP) — On a crisp, clear morning, a chestnut thoroughbred thundered down the dirt strip at Churchill Downs, his exercise rider leaning forward above the saddle. Other horse-and-rider pairs followed.

Dr. Will Farmer looked down from a viewing point, admiring the speed and agility of the 1,000-pound animals.

The whole world will have the chance to see horses in action here Saturday, when the Kentucky Derby shines a global spotlight on equine athleticism. It’s the subject of a growing body of research that cites a constellation of characteristics: big hearts, immense lung capacity, robust musculoskeletal systems and long, thin legs – all of which helped horses survive in the

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