Primrose Hill via Rhiw Briallu

At just 1.5km, Primrose Hill via Rhiw Briallu is short but deceptively intense — 104m of elevation packed into a brief, breathless effort. The average gradient of 7.1% disguises ramps of 15.1% — the kind of gradient that turns plans into prayers. It's over before the legs know what happened — a short, explosive effort where momentum is everything. Located in Wales, Wales.