it's totally fine to work out while you're on your period. if anything, it's better, because the physical activity can help you relieve the extra stress you may be feeling, or it can help get rid of cramps. although it is nice to have an excuse to be extra bitchy and lazy once in a while.
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So let the party and the sound rock on; We're gonna shake it til the life has gone. Rose tints my world keeps me safe from my trouble and pain...