Remember that story about the blind men and the elephant?  They were each trying to describe the elephant by what they touched but because they were blind, they could not grasp the concept that the elephant was greater than the sum of part which they'd grabbed individually.  Likewise, in this series of analyses, I've surprised myself at how much others are looking at how exercise & physical activity affects our health, regardless of whether we consider basic actigraphy , cardiorespiratory fitness , sitting time , television viewing time , etc, all variations on a theme.