The London Mountaineering Club has a running challenge that involves tagging all of Wales' highest 15 mountains in a single outing, with the aim of completing it in under 24 hours. The route and the order of the peaks isn't fixed, as long as all 15 summits are visited, you can go whichever way you want.
Back in the day, members would pore over the huge topographical map on the wall of the club's hut, tracing lines and discussing the optimum way to achieve the feat. These days, all you have to do is seek out someone who's done it quickly and ask for their GPX file. Easier still, pop their name into komoot or Strava and you can see their GPX plot, download it and upload to your own phone or Garmin watch.
