Secretariat is considered by many to be the fastest Thoroughbred in history, however without having the opportunity to race against the other great racehorses of the past no one will know for sure one hundred percent.
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Secretariat was a very large and powerful horse, with a 25 foot stride. He was a son of the speedy Bold Ruler, who often threw his speed into his offspring, which made him the top sire for years. Also, Secretariat's heart was larger than most other horses, a condition passed down from mother to son.
Yes, very fast but he ran slow in the beginning of the race the sped in front of the other horses in the end.
He was running at 39.6 mph in his stretch run in the Belmont, an unbelieveable speed for a horse.
Experts say that Secretariat was so fast because he had a 22-pound (9.97 kg) heart, more than twice the size of a typical thoroughbred's heart.