At the 151st Kentucky Derby, a global spotlight will shine on equine athleticism. It’s the subject of a growing body of research.

On display at Saturday's Kentucky Derby will be the speed and agility of these 1,000-pound animals. To stream 3NEWS on your phone, you need the 3NEWS app. Download the 3NEWS app ...

On display at Saturday's Kentucky Derby will be the speed and agility of these 1,000-pound animals. To stream WLTX 19 on your phone, you need the WLTX 19 app. Download the WLTX 19 app ...

What makes a Kentucky Derby champion? Big hearts, immense lungs and powerful legs. On display at Saturday's Kentucky Derby will be the speed and agility of these 1,000-pound animals.

What makes a Kentucky Derby champion? Big hearts, immense lungs and powerful legs. On display at Saturday's Kentucky Derby will be the speed and agility of these 1,000-pound animals.

On display at Saturday's Kentucky Derby will be the speed and agility of these 1,000-pound animals. To stream KHOU 11 on your phone, you need the KHOU 11 app. Download the KHOU 11 app ...

LOUISVILLE, Ky. — 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 ...

LOUISVILLE, Ky. — 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 ...

LOUISVILLE, Ky. — 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 ...

On display at Saturday's Kentucky Derby will be the speed and agility of these 1,000-pound animals. Experts say a healthy, ...