Many cyclists are used to checking the estimated VO2 max value on their bike computers, but how accurate is that data really? CT brings the Seagull Cycling Team partners into a professional exercise physiology laboratory to experience a national-team-level, million-dollar gas analysis system. The test subject wears a specialized breathing mask, attaches sensor leads, and performs a stepwise exhaustion test on a power trainer. The camera captures everything from the initial easy warm-up pedaling to the gradual increase in wattage, the heart rate nearing its limit, and the facial contortions and painful gasping for air. If you want a glimpse into the real process of top-tier cardiopulmonary testing, you absolutely cannot miss this extreme physiological challenge.