Pulse rhythmically is a term used to describe the act of throbbing, which is a regular and repeated contraction and expansion of an organ or other part of the body. This is often associated with the beating of the heart, as it contracts and expands to pump blood throughout the body. It can also be used to describe the movement of muscles, such as when a person is running or exercising. Throbbing is a common symptom of many medical conditions, including high blood pressure, heart disease, and anxiety.