Group 1 - The popularity of tennis is increasing, with many celebrities and individuals taking up the sport [2][3][12] - Tennis coaches in major cities like Beijing and Shanghai can earn significant incomes, with rates ranging from 400 to over 1000 yuan per hour [7][10][19] - Other sports coaching, such as skiing and Pilates, also show high earning potential, often exceeding the income of typical office workers [18][21][23] Group 2 - The trend indicates a shift towards sports and physical activities as viable career paths, especially as AI threatens traditional office jobs [25][28][30] - The demand for skilled physical labor, such as sports coaching, is expected to remain strong, as these roles cannot be easily replaced by AI [29][33][34]