Why do I get sore shins when I swim breaststroke?

Anyone get this as well, it happens after about 4 lengths and it can become unbearable.|||I used to get that, it was Shin splints, but thats was because i also did a lot of heavy impact sport as well as swimming. It could just be a lactic acid build up in your calves as you have been using them a lot. Try not to kick to hard maybe work on your muscular strength and endurance.|||try not kicking AS hard, just for practice you could also be kicking wrong good luck|||cuz the frog kick require calves (front and back) muscles too.|||Hi, You don't say how long you have been swimming. If you are new to the sport then you must make sure you are well warmed up before you start swimming, and when you get into the pool don't go straight into swimming lengths, do half lengths first, and build up slowly. This should help a little. However, it this continues to be a problem then you should seek medical help.|||Your legs probably aren't used to the action of kicking so gradually build up the amount you do and take a break with front crawl to relax your legs. Hope this helps :)