Physical fitness and menstruation

Staying physically active helps in relieving the general discomfort associated with periods. From my own experience I have found that staying active and busy takes your attention away from discomfort due to cramps and actually helps in easing it.

Light exercise helps in releasing beta endrophins ("the feel good hormones") within the body. These chemicals uplift the mood and alleviates mood swings. Endrophins also serve as the body's natural pain relievers. Physical activity relieves cramps by increasing blood circulation and reducing tension in the uterine and lower abdomen muscles. Sweating helps in getting rid of excess water from the body and helps provide relief from bloating.

Reference

http://www.fitsugar.com/Can-Exercise-Affect-Your-Menstrual-Cycle-406373

http://www.kotex.com/na/articles-info/staying-fit/50202

http://www.fitsugar.com/Can-Exercise-Affect-Your-Menstrual-Cycle-406373

http://kidshealth.org/PageManager.jsp?dn=KidsHealth&lic=1&ps=307&cat_id=20183&article_set=10319

Many do not indulge in physical activity during periods,because they end up staining their tracks or shorts.I was that way until i got to know about adira period panties from my friend,thanks to her! I have never stained when i wear them.

I found that keeping my abs and thighs fit made a difference in reducing my cramps as a teenager ... eventually I stopped getting them. So I would do situps, leg-lifts, bicycle, and general walking and running.