Get up from your chair and straighten out your desk as quickly as possible.

Guess how many steps it will take to walk to a spot nearby. Test your theory.

Try to recall the contents of your pockets or bag. Write down as many as you can.

Close your eyes and think of a colour, then imagine five different things of that colour.

Close your eyes and feel a wave of relaxation start at your hgead and travel through to your feet.

Drink a glass of water in exactly 30 sips.

Hum the tune to 'Twinkle Twinkle Little Star'. Then hum the alphabet song. Then 'Baa Baa Black Sheep'. Think about the similarities.

Eat a snack, taking a small bite exactly every 10 seconds.