The standard size of a professional weightlifting competition barbell is 20 kilograms (approximately 44 pounds) for men and 15 kilograms (approximately 33 pounds) for women. These barbells have specific measurements and are designed to meet international competition standards, ensuring uniformity across events. Athletes train with these weights to perfect their technique and maximize performance. Understanding the specifications of competition equipment is essential for athletes as they prepare for various lifts and achieve their goals during competitions.