Really interesting article, thanks.
I vividly remember when I was training for an event, and I was doing a very hard long interval session. I’d got my period that morning, and half way through the run I was in such agony I stopped and curled up in a ball next to a hedge, howling in pain and trying not to puke. I didn’t know I had endo at that point, I was diagnosed about a year later. Then I had the pattern of relapses and surgeries every two years, and I never got back to my pre endo level of fitness because it wrecked my body too badly.
The “10% of people with endo” makes me so angry. Reminds me, I must fire off a letter to the Endometriosis Society, who appear to have forgotten what a woman is recently, and have been perpetuating this sort of nonsense.