Low level laser light reduces the stability of adipocyte cell membranes, allowing cells to release their stores of fat without damaging the cell. Because the fat is released into the extracellular space, cardio based exercise is usually promoted after the procedure. Exercise increases lymph flow and is thought to also promote the use of the lipids as an energy source. This is also why adequate hydration is encouraged. The laser technologies are differentiated mainly by the wavelength of light used.