Russian Stimulation (RUS) is a specific form of electro-stimulation with a Symmetrical Biphasic Square waveform produced by dividing a 2500 Hz carrier frequency into 50 Hz packets. It is a single standalone protocol. It consists of 11 cycles lasting approximately 15 minutes. Originally developed by the Russian Olympic team for muscle mass enhancement, is now most recently used for muscle strengthening in the United States. It is designed to stimulate motor nerves. However, the frequency of a Russian stimulator at 2500 Hz vs. an EMS device allows for a deeper muscle penetration and a more complete/stronger contraction of the muscle fibers.