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.