That is the question posed by Vybarr Cregan-Reid. In his article, he details how our lives are becoming more sedentary and exercise is simply one of the tasks in the long list of things that we need to do every day. And one of the reasons why we tend to set it aside is the fact that our obligations to other people take more precedence and so we don't mind putting it off.
We would also rather engage in more leisurely and less physically strenuous activities after a regular working day so exercise doesn't really have as much a priority today. Even ordinary physical chores and tasks which were more common a century ago have been easily replaced through various means that make our lives more convenient.
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