The term "elliptical" refers to a shape that resembles an elongated circle, often described as an oval. In geometry, an ellipse is defined by its two focal points, and any point on the ellipse maintains a constant sum of distances to these foci. This shape is commonly seen in nature, such as in the orbits of planets like Earth around the Sun. In fitness, "elliptical" often refers to an elliptical trainer, a popular exercise machine that simulates walking or running without putting too much stress on the joints. This low-impact workout is great for cardiovascular health and can help improve endurance while being easier on the body compared to traditional running.