For the past two months I have had a strange occurrence of cramps that begin around the 1500 meter mark during my swim workouts. The main culprit is in my toes, especially the one next to the big toe. This occurs in both feet at differing times. In addition, tonight these cramps also appeared in my right heal. Tonight it got so bad; I had to cut my swim session short. I have never had these during running and only once during a very intense speed session on the bike.
Has anyone else suffered from this issue? And if so, how have you fixed the problem?