Electrostimulators with programs for relieving muscle stiffness use electrical impulses to relax tense muscles. These programs work by sending gentle signals through electrodes attached to the skin into the muscle, causing it to repeatedly contract and relax. This process, similar to a gentle massage, increases blood circulation in the muscle tissue. Better blood circulation delivers more oxygen and nutrients to the muscle and simultaneously helps to remove waste products, which contributes to releasing tension and reducing the feeling of stiffness. These functions are suitable for regeneration after physical activity, for discomfort caused by prolonged sitting, or as a relaxation procedure.