Training for Strength or Endurance - Part II

While it is clear that exercise is beneficial, how does one decide what to do to get and stay fit?

Besides doing an activity because we "enjoy it," how do we know that we're better off doing a specific type of physical activity versus another?

Below is the video recording of this experiment: Training for Strength or Endurance - Part II December 2014 - March 2016. A summary is also available on this QS article.

The first part of this experiment, Training for Strength or Endurance Part I - December 2014 - December 2015 is available here.