During the retreat we will spend a lot of time in the water and we’ll have lot’s of physical activity. If you have the option to go swimming more often that is great.
Since that isn’t possible for everyone, there is this page to help you out. Here is a list of low impact workouts that can help you prepare.
These should help improvement in both your stamina and flexibility. These 2 things will make mermaiding easier.
These videos are suggestions, find something that you like.