A recent study by the University of Miami studied the effects of meditation developed by the Mind Fitness Training Institute for the US Marines. The soldiers spent between 12 to 15 minutes a day engaged in mindfulness meditation—which, explained simply, is a focused concentration on the present. For example, sitting in a chair, eyes closed, focused on nothing but your breathing, and the feeling of the air coming in and out of your lungs.

The result? Researchers reported that the Marines who meditated scored better on mood and memory evaluations, They also found improved athletic ability, relief from anxiety and better sleep.

Of course, you don't need to be on the front lines to suffer from unhealthy stress, which can weaken the immune system and wreak havoc on your mood and memory. Sometime during your likely over-scheduled day, in between bouts of texting and emailing, find some time to unplug. You don't need any special equipment, it's completely free (and freeing).