Quote Originally Posted by Becky View Post

I did feel some fatigue in my upper quad, just to the inside of my hip, and near the crease of my leg. Is this my TFL muscle that I'm feeling, and could this be the cause of my ITBS? Perhaps this means I'm overusing the TFL and not using the glutes enough....
That does sound like you're describing the TFL, and your hypothesis about overusing it/underusing the glutes is probably right on. For running outside when it's cold, I'd suggest very minimal shoes to replicate as best as possible the barefoot running form. Not quite the same as actually being barefoot, but still helps.