Innovative length-adjustable and flexible leather triangular reins for riding or lunging. The W-trainRein triangular reins are attached to the saddle girth or lunging girth between the front legs. A special rein runs through a pulley and is guided from there through the bridle rings (from the inside to the outside) back to the saddle girth or lunging girth. Due to the pulley, the rein gives way and facilitates gentle, mouth-friendly bending and gymnastics while riding or lunging.