 The goal of the proposed research is to clarify the relationship between iron status, physical performance, and aerobic exercise training. By conducting an iron intervention study in combination with an exercise training program, the investigators can examine the modifying effect of iron status on the physical performance changes from aerobic exercise training as well as the modifying effect of participation in aerobic exercise in maintenance of iron status. To achieve this goal, a randomized double-blind, placebo controlled trial will be conducted with Chinese collegiate women. 