Phased, customized exercise prescriptions: Scientific weight loss schedules for teenagers, white-collar workers, and the elderly.

The approach and plan for weight loss through exercise should differ for obese individuals of different ages and occupations. Teenagers typically have heavy academic burdens, with long hours spent in class and doing homework, making it difficult to schedule dedicated exercise for weight loss during the school term. Summer and winter vacations are the best time for obese teenagers to engage in systematic exercise. A regular schedule should be established, with at least three hours of planned exercise scheduled twice a day. Those who can afford it can participate in a fully enclosed summer camp, which can not only achieve weight loss goals but also cultivate good eating and lifestyle habits through group management, integrating healthy weight loss into daily life in a natural, harmonious, and sustainable way.

White-collar workers typically have relatively stable working hours, but prolonged sitting and lack of physical activity are common. For overweight or obese individuals, a relatively stable after-get off work schedule is ideal, and it's recommended to exercise at least four times a week for at least two hours each time. Taking a month-long intensive exercise and weight loss program during annual leave is a good option for self-transformation. The "golden time" for exercise is from after get off work until dinner. Suitable activities include brisk walking or jogging; walking is both economical and safe. Remember to rest for at least 30 minutes after exercise before eating. For lunch, white-collar workers can choose meal replacement products, which are convenient and effectively control calorie intake.

Obese elderly patients often suffer from hypertension, hyperlipidemia, and hyperglycemia. Appropriate exercise is crucial for improving these conditions and enriching leisure time. Since older adults have ample time, they can choose to exercise after sunrise in parks or playgrounds with fresh air for jogging, brisk walking, or fitness dancing. An evening walk after dinner is also an excellent choice, but it should not be too long, no more than two hours at a time. Older adults should pay special attention to exercising in a comfortable temperature environment and avoid extreme weather conditions that could stimulate their cardiovascular system.

When discussing the effects of exercise, many people are concerned about the difference between "exercising once a day" and "exercising twice a day." Theoretically, if the total time is the same, a single, continuous workout is significantly more effective than two separate workouts. Even with warm-up exercises, the increase in functional and metabolic levels after the main workout takes time. Metabolic mobilization typically only becomes significant 15 minutes after the start of exercise. Assuming a total workout time of one hour, a single effective workout is approximately 45 minutes; if divided into two 30-minute sessions, due to the mobilization period for each session, the actual effective workout time combined is only 30 minutes.

Especially for exercise-based weight loss, it takes approximately 20-30 minutes for the fat mobilization and breakdown rate to reach a high level, and even longer for women. If each exercise session lasts only 20 minutes, the proportion of energy supplied by fat is low, resulting in less than ideal effects. High-intensity but short-duration exercise primarily consumes glycogen, and fluctuations in blood sugar can lead to significant hunger and increased food intake after exercise, often resulting in the misconception that "the more you exercise, the fatter you become." Therefore, it is advisable to schedule at least one instance of continuous aerobic exercise daily, which not only helps burn fat but also regulates lifestyle and relieves stress.

Choosing the right time to exercise during the day also requires considering the natural environment. In summer, when temperatures are high, early morning or late afternoon is preferable to avoid ultraviolet radiation and significant water and salt loss. While there are slight differences in air quality between morning and evening, these differences are usually insufficient to limit exercise. The real threat comes from smog or excessive PM2.5 levels. In winter, when ambient temperatures are low, the body reacts strongly to cold stimuli. Vigorous exercise is not advisable immediately in the early morning; it is best to exercise between 9 and 11 am or 3 and 5 pm when temperatures are relatively higher. Cardiovascular patients should warm up indoors before going outdoors in winter.