20 kg. Barbell is a core training equipment, which is also used in weightlifting. Barbell is a kind of weight training, which only uses barbell training equipment to improve muscle strength training. Gymnasium barbells are 20kg empty bars, and barbells are widely used. Regardless of the muscles in the shoulder, back, arms, chest and other parts, through the use of barbells and iron plates with different weights, muscle endurance training is carried out for many times for the whole body muscle groups, thus burning fat.