Look at the Glut4, VO2-max and mitochondrial density data. Even though there were significant differences between HIIT and AE, it was still very difficult (if not impossible) to look at data from an individual subject and decide which group it came from. Why

Looking at the Glut4, VO2-max and mitochondrial density data we can pinpoint to several differences and changes/variation in what the data reflects and / or the sample size used in the research analysis was extremely little that the average was totally misrepresented by an individual animal that was uncommonly high or low.

parable of the tares

explanation:

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer