GR50 HMS are two durable chains to attach to the bar. The product is made from high-quality steel. Its practical and durable mounting system on the bar makes it a versatile tool for your home gym. It fits well with both Olympic bars and standard bars. It is recommended for anyone looking to fully unleash the potential of weight training. The individual links of each chain increase the weight of the bar when lifted off the ground. The weight of the bar is at its maximum at the highest point of the lifting movement. When the bar is lowered, the opposite situation occurs. The weight decreases proportionally to the length of the chain resting on the ground. The GR50 chains HMS have a positive impact on the physiological processes occurring in the muscles during exercise. This involves the use of post-activation potentiation (PAP) - muscle strength improves if the initial activation phase is followed by a maximum increase in contraction strength. Using chains for strength training also help.