Should you log a sweat session on a machine in the gym or head outdoors for a workout? Choose the latter and you’ll get an instant mood boost, according to a report published in Environmental Science & Technology. Researchers found that people felt happier after just five minutes of being active outside—and breaking a sweat near a body of water provided a more powerful feel-good effect. So hit the trails or go for a swim— you’ve got a pass to skip the gym!