A gym bar, also known as a barbell, is a weightlifting equipment used in strength training and fitness exercises. It typically consists of a long metal bar with weights attached to each end.

The weight of a gym bar can vary. Standard Olympic barbells, commonly used in gyms, weigh 45 pounds (20.4 kilograms) for men and 35 pounds (15.9 kilograms) for women. However, there are also lighter barbells for specific exercises or beginners, and heavier ones for advanced lifters.

The primary use of a gym bar is for resistance training. It allows individuals to perform a wide range of exercises, such as squats, deadlifts, bench presses, and more. The versatility of the gym bar makes it a fundamental tool in building strength, muscle mass, and overall fitness. It's a cornerstone in weightlifting routines and essential for those aiming to develop various muscle groups effectively.