Although runners still must keep an extreme diet, excercise, and hustle, this evidence supports the fact that athletic and compettitve running is immensly effected by biology. Runners with shorter heels ussually to have not only quicker times but better acceleration which deffinatly affects olympic runners and the times they achieve. DNA and ginetics as a result of biology could change the outcome of a runners speed and show how certain runners are born more possibly for an athletic enviorment. This is a key example of how biology affects athletics.