runners may spend months training to compete，other runners and walkers might not train at all.

　　3

　　not competing to win might run in an effort to

　　4

　　their own time，or

　　5

　　to enjoy the fun and exercise.People of all

　　6

　　，from those less than one year old to those in their 80s，

　　7

　　into this sport.The races are held on city streets，on college campuses，

　　8

　　parks，and in suburban areas，and commonly 5 to 10 kilometers in

　　9

　　.

　　The largest footrace in the world is the 12­kilometer Bay to Breakers

　　10

　　that is held in San Francisco every spring.This race

　　11

　　on the east side of the city near San Francisco Bay and ends on the

　　12

　　side at the Pacific Ocean.In 1993 there were 80,000 people

　　13

　　in this race through the streets and hills of San Francisco.In the

　　14

　　are the serious runners who compete to win，and

　　15

　　might finish in as little as 34 minutes.Behind them

　　16

　　the thousands who take several hours to finish.In the back of the race are those who wear various clothing just for

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