This article is from Bitch Magazine (a non-profit, independent, third-wave feminist magazine based out of Portland, OR.) They describe themselves as a "Feminist response to pop culture", which as you may have guessed by now, is right up my alley.
This particular article gives a little background on the history of women in the sports and fitness arena and reviews a recent report titled "Her Life Depends On It" by the Women's Sports Foundation. This extensive report which outlines some of the barriers for women in fitness, sports, and physical activity in general.
You can download the full report, and I recommend you do! Here: http://www.womenssportsfoundation.org/Content/Articles/Research/H/Her-Life-Depends-on-It-II.aspx