A barbell is a piece of weightlifting equipment consisting of a long metal bar with weights attached at each end. It is commonly used in strength training exercises to build muscle and improve overall fitness. Barbells come in various sizes and weights, allowing users to adjust the load according to their strength and training goals. Barbells are often used in exercises like the bench press, squat, and deadlift, which target different muscle groups. They can be found in gyms and fitness centers, and are popular among athletes and fitness enthusiasts for their versatility and effectiveness in resistance training.