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The body visibly reacts to light, including red light. Red light is one of the wavelengths of sunlight (600 to 700 nm). Near-infrared is light that is invisible to the naked eye (850 nm). The wavelength affects the depth at which the light penetrates the tissue. Gentle exposure to red light particularly impacts the mitochondria in the cells, which are found in muscle cells and nerve cells, leading to improved performance.