May Day is a common holiday for working people all over the world. The origin of Labor Day actually originated from the workers' strike in Chicago, USA.
The author also wants to talk to you about the relationship between labor and sports. He says non-manual workers need to increase their daily physical activities. The more time they spent doing housework as physical activity, the more weight they weighed, he says. He also argues that manual work can indeed help burn body calories, if different housework is converted into the number of walking steps.