A deficiency in magnesium can cause muscles to contract, and modern day diets are much lower in magnesium than those of days gone by.

You can get magnesium from bananas, avocados, and soy  to name a few, but if you want to go right to the source, you might get on with a magnesium bath soak or rub.

There are quite a few brands available that you can pick up in a health food store, like Holland and Barrett – BetterYou offer a range of soaks, sprays and body rubs.