Exercise - A tip on how to swim effortlessly without feeling tired

To add a variety to my current exercise regime, I went for two swims this week, something which I didn’t do for more than 10 years.

In my younger days, though I learnt both the crawl and the breaststroke, almost 100% of the time when I swam, I only used breaststroke. Why? Because this is something which I can do effortlessly while doing multiple laps and without tiring myself out.