A hurdle has a supporting frame and two crossing rods. The two crossing rod each respectively employing a connecting joint, a spring, an engaging member, and a locking screw engageable with two opposing standing bars. The supporting frame includes the two standing bars and a horizontal aperture. The crossing rod has a hollow rod body, a soft protector jacketed onto the rod body, and a secure aperture disposed through an end of crossing rod. The connecting joint includes a hollow tubal structure with an axial hole, a connecting section with a smaller diameter is disposed at an end, a combining aperture disposed on the connecting section. An end of the spring is a hook end and another end is a screw stem having a threaded section and an inner threaded aperture, and the hook end of the spring is placed into the connecting joint through the axial hole.