Treading water can be practiced as a form of physical activity that becomes easier with consistent practice.

“it's it's um it's like doing stairs if you practice doing stairs it gets easier to do stairs but nobody's good at doing you know marathon runners can't run up the stairs it's a you know it's a particular thing and treading water if you just do it in even in the little bit of time that we were doing it every day by the end of your stay it was easier for you than when you started”