It might sound unpleasant, but spending three minutes in a chamber cooled down to a bracing -135˚C, is actually an exhilarating, endorphin pumping experience, according to Champneys Tring in the UK, which is now offering cryotherapy (or kriotherapy).

Workouts are enhanced after time spent in a cryochamber, so packages combine time in the room with an exercise programme.

Only three minutes can be spent in the chamber and modest exercise has to be undertaken.

In addition, wooden clogs, socks, gloves, a mouth mask, a top and shorts must be worn.