At last she swims

I think I have finally got it. Saturday swim session at the pool, managed to do 30 lengths but this time I wasn't exhausted after every length. I think I have finally mastered the technique of rolling, breathing, zipping etc. I did manage to swallow water a couple of times, but in general I think I have finally cracked it! My only low point, I got cramp in my calf and toes?? I believe its to do with water or salt, so I will have to look it up. But I feel great.