Harmful, not good for the lumbar spine. I am a fitness instructor. Healthy weight loss depends on exercise. You can warm up for 5 minutes first, that is, jogging, and finally aerobic endurance. This is the law of losing weight. The last aerobic endurance exercise is the simplest, but if you want to lose weight, you must keep jogging for more than 40-60 minutes. You can walk for 10 minutes at first, and then you must run, but at a slow speed. It's best to stick to it for a while. These are all for exercise. I hope you can eat and drink at ordinary times. Finally, I wish you success!