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SUP yoga: The practice of yoga on a paddleboard

25 July 2014 Last updated at 00:20 BST

Yoga requires focus, stamina and patience.

But if that still sounds a bit too easy you could try a new form of yoga being taught in Cornwall.

SUP yoga - or stand up paddleboard yoga - involves most of the usual yoga positions, but with the added complication of it being done at sea on a paddleboard.

Jen Austin runs a yoga school in Newquay and teaches the practice when tide and weather allow.

BBC News went along to a class.

Video journalist: Dan Curtis

Stop/Start is a series of video features for the BBC News website which follows both new trends that are beginning and old traditions that are coming to an end.