One Horsepower is displacing 1 lb. by 33,000 ft. in one minute or 33,000 lb-ft / minute. 1HP = 1 lb x 33,000 ft / 1 minute.
In other words, One Horsepower is displacing 550 pounds (250 kg) by 1 foot (30 cm) in 1 second.
(See also ‘Brake Horse Power’)