A horizontal bar includes two side supports, a top bar, and a swing member. The side supports are provided at upper ends with two symmetrical locating holes, through which two outer ends of the top bar are extended to thereby connect the top bar to the side supports. The swing member includes horizontally paralleled upper and lower bars connected to each other via a plurality of connecting plates vertically extended between the upper and lower bars. The upper bar is a hollow tubular member put around the top bar, and the lower bar is covered with a sleeve. The horizontal bar includes simple parts that can be easily assembled and disassembled, and can be connected to other types of sporting goods for more kinds of exercises.