4
arena
artificial
athlete
athletic
background
billboard
board
challenge
color
colorful
compete
competition
competitive
concentration
course
curve
determination
direction
empty
exercise
field
finish
first
forward
four
game
ground
lane
lifestyle
number
outdoor
pattern
race
racecourse
racetrack
red
run
score
spirit
sport
sprint
stadium
start
strong
success
surface
texture
track
winner