We completed pretrials a few weeks before the set week started because our research requires 100 runners to test, so we are in the process of testing high school teams now. Our pretrials consisted of a few MMSTC classmates running through the hallways and sitting in the three different positions. The distance was smaller than an average high school track, however, the pretrials allowed us to improve our experimental design for a better heart rate reading. We were able to get used to using the Wahoo Fitness application so that we were not scrambling to find the data that needs to be recorded during a trial. We realized that the Wahoo BLUEHR chest strap heart rate monitor did not stay connected to the Wahoo fitness application because the signal got weaker as they ran further from us, so we had the runners hold the devices as they ran. We changed the data collection process as well. Instead of using the maximum heart rate during the participant's run to determine the heart rate recovery, we are now using the heart rate they have immediately after they are done running.