Get Some Exercise -- Period
There are just some times of the month when, regardless of how much of a gym rat you normally are, you can't seem to get moving. Or it just plain hurts to engage in the exercise you usually do. If periods cramp your fitness style, then there are some ways to get moving again. There's no reason not to continue working out, but it's certainly OK to take a rest or scale back your workouts if you need to.
Exercise increases blood flow and releases endorphins, plus it loosens muscles in cramp-prone areas like the abdomen, back and thighs. Exercise gets your lymphatic system moving as well and flushes extra fluid from your body, reducing that bloated feeling. Hormonal fluctuations may leave you feeling depressed, angry or anxious, and exercise can reduce those feelings. A consistent fitness program can even help your periods become lighter and shorter. But training vigorously - for a runner, that would mean up to 30 miles a week - can stop periods, due to drastic fat loss.