Most studies general last at least twelve weeks. Generally, muscle takes six weeks to progress. Another area of this study that could have improved upon would for Fletcher and Hartwell to increase their sample size. By only including eleven males, one could not assume that every male golfer would improve their club speed and driving distance by the same increment that the subjects in the study did. The sample size in the study include males that were between the age of 21.6 and 36.4. By using the results, one could not make the assumption that a 65-year-old would make the same progression for the same plyometrics and weight training like the volunteers in the experimental group. Although there were areas in this study to approve upon, there was numerous positive aspects of the study. The study accurately selected the “right” males to undergo this study. Only untrained males were selected for the study. To be considered untrained, one could not have exercised within the previous six months. By selecting untrained subjects, it would accurately show muscle growth a period of time. If they would of chosen subjects that had of trained prior to the study, the results would have been inaccurate due to the fact the volunteers would of previously have x amount of muscle