Merrion Square: Since the controlled tree massacre of 2015, light now floods the south and east quadrants, to uplifting effect. Photograph: Tom Honan As a lapsed running club member reduced to solitary slogs around the streets and parks of Dublin, I still occasionally attempt to replicate the interval training of old: doing short, high-intensity repeats at something like pace. The rule used to be: run hard enough that conversation becomes impossible. And the second part of that goal, at least, is easier to achieve when you’re alone. But on a recent outing in Merrion Square, I also surprised myself by...