"The sovereign invigorator of the body is exercise and of all the exercises walking is the best" (Thomas Jeffereson V.S.president)

Jeffereson was a great thinker with very strong ideas about many things. This was his idea of how one stays healthy and vigorous.
He also said:
A strong body makes the mind strong. As to the species of exercises, I advise the gun. While this gives moderate exercise to the body, it gives boldness, enterprise and independence to the mind. Games played with the ball, and others of that nature, are too violent for the body and stamp no character on the mind. Let your gun therefore be your constant companion of your walks.

So,like Thomas Jefferson I think that walking is the best sport anyone can take up,beacause it isn't that dangerous and it also has its advantages,like : not having to worry about getting late to practice or getting hurt while doing it.