or "Could you show me how to Bend?"
This request can never be satisfactorily addressed in a direct way. Feeling that you do not know how to bend means that reaching downward has become painful or at best uncomfortable or difficult for you because your joints feel stiff. That is the first misunderstanding that needs to be tackled: it is not generally the joints themselves, but the condition of the muscular rigging of your whole body which allows or prevents the smooth movement of one part upon another at your joints. Only when the whole body is operating satisfactorily will bending be easy. You cannot bend well unless you stand well. When you can do that, bending is as simple as it was when you were a year old.