Eric is a highly trained cross-country runner and his brother, John, is a computer programmer who almost never exercises. While the two brothers were working on a remodeling project in the basement of their house, the doorbell upstairs rang. A package they were both excited about was being delivered. They raced each other up the stairs to the front door to see which one would get the package first. When they reached the front door, both were breathing heavily. However, John continued to breathe heavily for several minutes while Eric was opening the package. Explain why John continued to breathe heavily longer than Eric, even though they both had run the same distance.