Low to moderate exercise (15-20 miles/week) begun in sedentary women with regular cycles and > one year buildup will not result in problems. Moderate to intense training (30-50 miles/week) building up over two months in young women will more than likely result in significant menstrual abnormalities.
1 Phone Number: The contact phone number for Comcast headquarters is 1-215-286-1700.  Fax Number: All fax communication with the corporate office should be sent to 1-215-981-7790.
Corporate Phone Number (215) 956-8000 Monday - Friday, 8:30 a.m. to 5:00 p.m., Eastern Time