Iron is an essential mineral for the human body. Iron is integral in transporting oxygen throughout the body and is also an important part of producing energy. Unfortunately, something like 15% of women are iron deficient. And you should note that when you engage in strenuous activity your bloodflow is increased, which subsequently depletes your iron (due to the higher turnover of red blood cells). So for a female athlete or a woman involved in strenuous activity, keeping blood enriched with iron is vitally important.
Iron exists in your bloodstream as part of an oxygen-transporting protein named Hemoglobin. Iron also exists within your muscle cells as part of Myoglobin protein which receives and stores oxygen inside muscle tissue. If your blood is deficient in iron you’re going to be having a short training day accompanied by a long recovery.