"If you want a dog to race,you have to give him a rather silly looking mechanical hare to chase and keep him on a slim diet.  Other animals have to be lured with a piece of meat hanging infront of their noses.  But a horse will run for just  the moral resolution to get somewhere ahead of his fellows"
What in most horses is "A moral resolution to get somewhere ahead of his fellows"?
Is in the Thoroughbred a compulsion?.  The Thoroughbred quiete simply is born to run, To gather and thrust his long limbs, propelling his long lean frame  stride after stride with a speed that forbids all others except the Quarter Horse wich is a suitable match only over short distances. At longer runs, from the half mile upward, the Thoroughbred is not only that fastest of all horse types, but is considered by many naturalists to be the swiftest creature in the world.  True, other animals such as the Cheetha wich approach 70mph. this lasts only a fleeting moment and afterward leaving the animal exhausted and limp. While the Thoroughbred who can achieve speeds up to 50mph, can easily continue this pace for a mile or more.  Nor does he run because he is stimulated by violence or hunger. He runs because running is the fullfilment of his design as a being.  And just because he is a Thoroughbred with a brand of courage and determination that will neither shrink in the face of pain nor death.  No one among the older generation of horse lovers who recalls Humorist. The English racer who took many victories following world war 1, can ever erase the memory,triumph and agony surrounding his winning of the Epsom derby Crown.  Less then 2 weeks after winning this grueling race Humorist was found dead in his stall, lying in a pool of blood.  Not until a autopsy was performed that it revealed he had suffured from major pulmonary disorders and had won all his races including the Epsom derby a 2 1/2 mile race, running on one lung. In the span of a decade the Illustrious Belmont stakes had seen 2 great throughbreds crossing the finish line under similiar curcimstanes.  in 1958 Tim Tam bravely fought to second place honors with a broken sesamiod bone shattered into splinters, causing unbearable pain to his fore foot. And in 1967 the Canadian champion Cool Reception challanging the winning damascus for the lead broke the vital cannon bone of his fore leg but pressed forward, undaunted to arrive 2nd place at the wire.  These heroics are widely publicized and long remembered when performed. Gallant Neb, a seasoned old racer who appeared in the field at Suffolk Downs in what turned out to be his last race.  Comming out of the far turn the pack got wedged into tight quarters, a collission took place. Gallant neb went flat to the track, but wasnt the kind of horse to stay there, he staggered to his feet, running dead last and riderless churned across the finish line to the crowd cheering, approving his game effort but the cheers came to a odd hush.. then a horrified gasp, not only was Gallant's neb rear leg broken but spinning lose from its joint.  Not until the line was cross did Gallan Neb collapse to the track.  The elemental fact of the thoroughbred, is it posesess the look of the eagles and by nature the heart of a lion.  The genorosity of the Thoroughbred's heart is a gift.  Less mysterious then "The look of the eagles".  That makes it physically possible for one horse to acheive such a speed that would leave all others in the dust.  The body of the Thoroughbred is lean, angular, never round and sloping.  Even when fed to be a plump size after retirement.  Toward the aft of the barrel they are noticably wasp- waisted, tapered to a lower rear girth. The chest broad, the heart infact is larger then many other larger animals and is and its significantly related to its coragous spirit. 
Kelso indeed... a horse of a lifetime, one who at a time when racing was said to be a cold and calculated business. has symbolized all the qualities and nobleness, That make the thoroughbred the prince of all horses.  He raced standing ovations and tears of joy, shed usually by unmovable veteran track goers. In motion he was a vision of physical splender. Yet all the time you watched him run you knew that what the late Sunny Jim Fitzsimmons, trainer of champions had said was true.  "When it comes to the Thoroughbred, its the part you cant see that matters"