A 16-year-old girl riding a spinning bike will definitely lose weight. Four times a week for one month has obvious weight loss effect.
Slow cycling can be used in the initial stage of exercise, and the heart rate generally does not exceed 65% of the maximum heart rate for 20-40 minutes. After a period of time, gradually increase the intensity of exercise to become a medium cycle, that is, the heart rate is controlled at about 65%-85% of the maximum heart rate, and after a period of time, it can be strengthened to a rapid cycle to make the heart rate reach more than 85% of the maximum heart rate. (haste makes waste)
Pay attention to the uniform force on your legs and your knees should face straight ahead. Don't shrug, keep your back straight, and avoid hugging your back or leaning back too much, which will hurt your back.
After each exercise, focus on stretching the calf for 5 minutes, otherwise it will thicken.
Of course, diet and exercise should be coordinated.