In the early days of human existence, there was no need for formal instruction to engage in physical exercise. Early humans had to engage in a variety of tasks in order to live simply and comfortably. These tasks included hunting for food, preparing it, raising crops, building houses, gathering fuel, and numerous other activities.

However, as we began to establish civilizations, we began to delegate tasks to others and focus on one specific activity. As a result, many of us today engage in very little physical work.

Doing physical labor without any mental activity can lower the quality of your life, and doing mental labor without some form of physical activity can also lower the quality of your life. A balance between both physical and mental activity is necessary to live a fulfilling, healthy and happy life.