Robot, in particular painting robot for painting components, for example motor vehicle body components, with a) a plurality of robot elements (3, 4, 5, 6) which are pivotable relative to each other, namely a1) a first robot element that is stationary or movable on a travel rail, a2) a second robot element which is attached rotatably to the first robot element, a3) a third robot element in the form of a robot arm which is attached in a pivot plane to the second robot element, a4) a fourth robot element in the form of a robot arm which is attached pivotably to the third robot element, and b) at least one bendable supply line which is guided from the first robot element as a proximal robot element to the fourth robot element as a distal robot element, c) wherein the supply line in the proximal robot element is axially movable with regard to the longitudinal axis of the supply line so that the supply line can perform an axial compensatory movement during a pivoting movement of the robot, d) wherein the supply line comprises a compensation loop which is located on the proximal robot element, wherein the compensation loop allows the axial compensatory movemenent of the supply line in a pivot movement of the robot, e) a mechanical tensioning element, characterized in that f) the tensioning element is arranged stationary with regard to the proximal robot element and suitable to pull the supply line out of the proximal robot element, g) wherein the tensioning element applies such a large axial restoring force to the supply line that the supply line is always smoothened independently of the robot position, so that the supply line lies within the outer contour of the third robot element with regard to the pivot plane of the third robot element. a) a plurality of robot elements (3, 4, 5, 6) which are pivotable relative to each other, namely a1) a first robot element that is stationary or movable on a travel rail, a2) a second robot element which is attached rotatably to the first robot element, a3) a third robot element in the form of a robot arm which is attached in a pivot plane to the second robot element, a4) a fourth robot element in the form of a robot arm which is attached pivotably to the third robot element, and a1) a first robot element that is stationary or movable on a travel rail, a2) a second robot element which is attached rotatably to the first robot element, a3) a third robot element in the form of a robot arm which is attached in a pivot plane to the second robot element, a4) a fourth robot element in the form of a robot arm which is attached pivotably to the third robot element, and b) at least one bendable supply line which is guided from the first robot element as a proximal robot element to the fourth robot element as a distal robot element, c) wherein the supply line in the proximal robot element is axially movable with regard to the longitudinal axis of the supply line so that the supply line can perform an axial compensatory movement during a pivoting movement of the robot, d) wherein the supply line comprises a compensation loop which is located on the proximal robot element, wherein the compensation loop allows the axial compensatory movemenent of the supply line in a pivot movement of the robot, e) a mechanical tensioning element, characterized in that f) the tensioning element is arranged stationary with regard to the proximal robot element and suitable to pull the supply line out of the proximal robot element, g) wherein the tensioning element applies such a large axial restoring force to the supply line that the supply line is always smoothened independently of the robot position, so that the supply line lies within the outer contour of the third robot element with regard to the pivot plane of the third robot element.