For centuries in Ireland lifting huge boulders was a way to test strength and bond communities, says Instagram sensation Indiana Stones

David Keohan surveyed the County Waterford beach and spotted a familiar mound half-buried in sand: an oval-shaped limestone boulder. It weighed about 115kg.

He wedged it loose with a crowbar, wiped it dry with a cloth, dusted his hands with chalk and paused to gaze at the Irish Sea, as if summoning strength from the waves pounding ashore.