Cartwheel: A gymnastics movement where the gymnast moves sideways (in the motion the wheel of a cart would follow) in a straight line alternately placing the hands and feet on the ground and finishing with the body coming up to a lunge landing position.  The name cartwheel is so named because when a gymnast performs this, their arms and legs move like the spokes of a turning wheel.  There are a variety of cartwheels, including cartwheels for beam (starting forward and ending up facing in the opposite direction), side-to-side cartwheels, cartwheel 1/4 turn out (start and end facing forward) and even aerial cartwheels.