If you want to improve your mood – and your brain – you might consider going for a run. In a new study published in the journal Nature, researchers had 26 participants run on a treadmill for 10 minutes, completing cognitive tests before and after the run and before and after a 10-minute rest. They found that just a 10-minute bout of moderate-intensity running elicits a positive mood and increased executive function. It appears that just 10 minutes of running stimulates blood flow to the part of your brain that improves your thinking, decision making, and your mood.