I think I can lose weight as long as I persist. You can do two-way movement back and forth with elliptical machine practice. When practicing, you can generally practice forward for 3 minutes, then do backward for 3 minutes, and practice for 5-6 minutes in a group. It is best to practice 3-4 groups in each activity. The frequency of action should be gradually accelerated, but not too fast, and it must be within your control. If the weight is heavy, it is recommended to use an elliptical machine, because the impact of the elliptical machine on the knee is relatively small compared with the treadmill. So if you exercise for 40 minutes and persist, you will definitely lose weight. Believe in yourself.