Not hidden away no, and nothing to be ashamed of - I'm certainly not ashamed of a normal bodily function any more than I am the need to urinate etc. Not ashamed. Going off my own experience (have pcos) I'd have been extremely heavy and uncomfortable. Also, blood smells (perhaps TMI but when I've not changed sanitary products in a while, I do smell. Dont think anyone else notices as I'm probably hyper sensitive, but they would after time). Not a pleasant experience for the woman in question nor her fellow runners.
As I said, I call periods a normal bodily function. Urine and defecating are too. I would not be impressed if I saw someone with shit/piss on their trousers while running. Nothing to do with Shame or misogyny - everything to do with hygiene. Besides, call me old fashioned but periods are private to me, as are other bathroom activities and as such should not be flaunted in public. Its her body and her choice, but I do know I felt uncomfortable reading the article and did think 'whats the point'. She has access to sanitary products so I don't see why using other women who aren't so lucky as a reason is valid. Does that mean she'll stop wiping her arse with loo roll? some women don't have toilet roll after all 