Swimmer here… (well, restarted swimming last year after 30 years of no-sport… now I’m 50y)
…but, which number do we want to put here? and which is the result of changing this value?
EDIT: maybe the answer is already here SETTINGS PAGE - a guide to getting started - #8 by Gerald (I could have searched better… still, maybe would have been nice to have something clearer, as this post, in the description)