I have had an increase in frequency of calf spasms/cramps over the past 6-8 weeks. I was training for a marathon in mid-November and noticed a slight increase in the 3 weeks before. Since then I have spent about 4 weeks resting a stress fracture in my foot, so have not been running. I have always had the occasional night calf cramps (maybe about once a month or every couple months), but these now occur more like 3 times a week and are not only at night. I notice them most frequently when swimming (they've occured during kicking and pushing from the wall), when sitting with my legs elevated, when having sex, and occasionally when asleep. They occur in both legs and there is an apparent muscle "knot" as they start that I can usually aleviate by rubbing or putting weight on my leg. I continue to have residual pain in the leg for 1-3 days afterwards. I am typically pretty well-hydrated and have at least 1 banana a day, so I feel like my potassium should be adequate. I do spend most of my day on my feet at work. I also take Atenolol, but have been taking that for about 2 years without problems. Is this something I should be worried about? Right now it's more of an annoyance than anything else, although it is pretty scary to get a cramp mid-pool. I was just getting worried that it might be a sign of a circulation problem or muscle injury that I should get checked out.