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This is what is says on the event page:
This is a long mountain day so only suitable for walkers who know that they can dig deep and keep on going at a reasonable pace for the whole of the day.
We will navigate around Pen y Fan, reaching it's summit at lunchtime via it's steep north ridge.
This walk will take in a few other tops and is delightful in that it has three uphill sections but the rest of the day is spent walking long downhills or mountain ridges.
Full walking kit suitable for a mountain day is required as is a good packed lunch.