Maybe I'm the odd woman in here, but I get my cycles every 22 days or so now that I'm working out like a maniac (you should spend a day with me to see that's true) and eating healthier for more than a year now. Before that, it used to be every 30 days or so and the symptoms were absolutely debilitating. Exercise has helped me with my symptoms. I do mostly Cathe, but I also exercise outdoors, and I practice yoga once or twice a week. I've read that if your body fat percentage gets too low you can get amenorrhea. I was a runner in my late teens and I got my period only a couple of times per year, but I don't think I was too skinny back then (probably about 10lbs lighter than what I am now) so I wonder what was the cause exactly.