I've been swimming for the last couple years and currently swim 4 times a week. Two of those days I swim in the morning, the other two are in the evening. Whenever I swim in the evening and swim a set using swim fins my feet and toes tend to cramp up the next swim set.
I've tried lots of things, potassium and water because I read they help with cramps as well as stretching before and after the swim fin set. So far, neither has worked. My only other thought was perhaps the fins are the source of the problem. Swimming in the evening without using the fins doesn't bother me, so its not just because I swim in the evening. At the same time, if I use the fins in the morning, I don't cramp up either.
I was just hoping someone here might have a suggestion and/or solution as to what may be causing this.