Swimming is excellent exercise of course, but it's so much more than that: it can be a transcendental experience, offering us space to reflect and to escape. It's an antidote to screens and all-encompassing technology. Perhaps it's the shedding of inhibitions that come with a dip, or could it be that getting somewhere under our own steam is an act that's health-giving, refreshing and life-affirming? Whatever it means to you, swimming--alone or...