Do hard swim training twice a week for an hour at a time. (At least 80 lengths, crawl, butterfly, back and breast stroke) cover with Opsite Flexifix transparent film roll which I get from Amazon. Put a square of dressing in the middle of the square of Opsite so that it doesn’t pull the Libre out when I take it off. Having said that, I sometimes put it on to swim and leave it on the full 14 days. Which would be ideal for hols and swimming every day. It has never leaked, never come off and the Libre has not been affected at all by the swimming or indeed the tumble turns. Go forth and swim!