Donning a long-sleeved tracksuit top over her bikini and arms outstretched - Cox seemed amused by her admirable efforts to 'hang 10'.

This stunt involves having all your toes over the edge of the board while waving two 'high fives'.

Courteney prepares for some surfing in Hawaii

Aniston, who is single again following her split from British model Paul Sculfor last month, often holidays with Cox, her husband David Arquette and their baby Coco - whom she is godmother to.

It was Cox and Arquette that Aniston turned to when she went through her highly-documented split with former husband Brad Pitt in 2005.