填空题 A. to avoid psychological techniques.
B. to break records
C. to better understand the athlete's body and mind
D. to time and space
E. to be replacing the sporting challenge
F. to human performance

填空题 It is more difficult for today's athletes 1.

填空题 We don't know if there is a limit 1.

填空题 Research has helped coaches 1.

填空题 Scientific advances are suspected 1.