While it’s easy to think of animals such as cheetahs and antelope when considering long distance runners, they are actually made for speed rather than endurance. Humans are the only creatures on the planet who voluntarily run for long distances, and perhaps for good reason since our ancient ancestors relied upon this ability for survival.(source)
Some Additional Quick Facts:
Every single day, your heart produces enough energy to drive a truck for 32km (20 miles).
Our blood contains traces of metals, one of which is gold (around 0.02 milligrams).
If you used every muscle in your body to pull in one direction, it would be possible to lift nearly 25 tons.
In an adult human body, there are 100,000 miles of blood vessels.
Did you know that an adult human body consists of around 7,000,000,000,000,000,000,000,000,000 atoms?
If you uncoiled the DNA in all the cells in your body, it would reach to Pluto and back (10 billion miles).
The human mind is still greater than any computer, with your long term memory able to hold as many as 1 quadrillion separate bits of information in one lifetime.
One weird fact is that your gastrointestinal tract is around 30 feet (9 meters) in length and is a tube  running from your mouth to your anus.
During your life time, your heart will pump out nearly 1.5 million barrels of blood which is enough to fill 200 train tank cars.
