In the past, I could finish my fitness every day. Why do I suddenly have no strength to exercise this day? What is the reason why I didn't finish what I wanted?
It may be that physical strength is not enough, or it may be that the body has diseases, such as colds and gastrointestinal discomfort, which may affect the exertion of physical strength. If you don't have the strength, don't force yourself, lest your body get worse. Go to the hospital for a check-up and have a good rest for a few days until your physical strength recovers, and then continue to exercise.