I use my running (and deliberately shun the word 'training') as the daily reset button. The harder and busier the day is the more I need to do an easy run. This relaxation counters the toxic levels of stress that comes with being overextended as a family physician and other work commitments. If running were another stress it would not be sustainable, therefore my entire running is relaxed... We all have busy and stressful lives and the running must fit into the 'yin' of the 'yin and yang' circle.