What can you do in a 5 minute break?

Literally anything. Anything that takes your mind off revision.

Stretching and jumping jacks. You would be surprised at how much this helps if you are slumped over studying.

this isn't really helpful

This is a few ideas
Stretching
Horoscopes
Languages
Toy design

ooo interesting... i'll have a try

Drink water, have snacks, or go to the loo.

What do you want me to say? My answer applies to everything and anything. Workout? Already said that, albeit indirectly. Read a book? Again, already said that. It's up to you to fill in that time, not me lol.

done,done and done haha

Take a look a desk stretching routines. It really helps. once you master and are able to stretch further, it's like having that feeling when you stretch getting out of bed. you don't feel as tight when studying. Jumping jacks is just to get your blood pumping from being stationary.

And your five mins are still not over? What are you, Lightning McQueen?

i was looking for something a tad more specific, like what other people are suggesting.

Ooh, I've got one. Stare at a wall whilst tapping a pen. Is that specific enough?

All jokes aside, I'd suggest to read the news. Keep yourself informed about situations.

h e l l yeah
on a more serious note - i only want a snack like or two times in a day, and the loo only couple times, and drinking water, seconds, so that leaves like 5 or more breaks of 5 mins to fill