"We do a bit of endurance to get them fitter - marching on the spot, moving round the room in a circle to get the heart rate up a bit, " explained Ms Quaeck.

BBC: Balance class to help prevent falls by elderly people

That chain is in a circle that goes round and round, with no beginning and no end.

FORBES: Every Person Matters in a Company, and There is No Such Thing as an Insignificant Position

Later came intensive memorising of the star-compass, a circle of coral pebbles, each pebble a star, laid out in the sand round a palm-frond boat.

ECONOMIST: Mau Piailug