Sarah Renaghan, M.S. Magnesium – what does it do for – or to – us? As an essential trace element, it is vital to the human body. Magnesium facilitates over 300 enzymatic reactions in the human body in the areas of energy metabolism, electrolyte and ion balance, cell signaling, and protein synthesis, all of which relate to physical activity and fitness.  Magnesium plays both a direct and indirect role in the body’s physiological response to exercise conditions. E...