Got a big problem? Strike this pose.

The next time you’re really stuck on something - cross your arms. 

This body language hack really does help when tackling something tough. In a recent study, groups of students were asked to work on some puzzles and anagrams. One group was instructed to keep their hands on their thighs, while the others were to sit with their arms folded. The students who folded their arms almost doubled their attempt time. That group also came up with more solutions than the hands-in-the-lap group.

Body language experts say folding our arms can trigger our determination and perseverance. Sit up straight and smile - and add optimistic confidence to your problem solving pose.