let me tell you about iron supplements. 
now, i don’t know if it’s the iron itself or a placebo effect, but i started taking iron pills a couple weeks ago and my running time has gotten better and the time running has gotten better, too. i have a lot less fatigue while running; for the past few months my muscles have just been blah while running. 
so i did some research on fatigue while running, and the first thing that came up was iron deficiency. women runners are susceptible for a variety of reasons, including heel strikes while running! who knew. i tried out the iron supplements, and off i went. 
anyway, that’s a running update for you!