Our first hypothesis that athletes would have higher lung capacity than non-athletes was found to be false. After collecting data from individuals of varying heights and weights, athletic and non-athletic, we found that an individual's height and weight were better predictors of lung capacity than athleticism. The greater a person's height and weight, the higher their lung capacity, as larger individuals require more oxygen to support their bodies. While other factors like smoking or medical conditions could also impact lung capacity, this experiment supported the hypothesis that size, not athletic ability, is most associated with lung function.