That's a good question.
I've stated quite clearly that I don't believe there were any systemic barriers to my running. I think it was just a matter of my making a decision and sticking to it. For me, personally, the biggest barrier would be that I was always questioning my competency. I don't think that's gendered, though. I think that's just being a self-reflective person. I think that's just having an ounce of.... I'm at a loss for words.
I think it's just knowing what you're capable of and honing in on that. Whether that's actually a barrier, I'm not sure, but as far as systemic barriers go, I don't think that any existed to my running.