A 2012 report found that spending time in the out of doors made people 50 percent happier than spending time at the gym, according to the Telegraph.

Previous research has linked outdoor exercise with a reduction in tension, confusion, anger and depression, when compared to indoor activity. And it doesn’t have to be a long stroll in the park, either: A 2010 study found that even just five minutes of exercise in a green space can improve mood and self-esteem, the BBC reported.

A small study from the University of Illinois at Urbana-Champaign found that kids with ADHD were able to concentrate better after a 20-minute walk in a park rather than a walk through city or neighborhood streets.

“What this particular study tells us is that the physical environment matters,” Frances E. Kuo, director of the university’s Landscape and Human Health Laboratory and one of the study’s co-authors told The New York Times. “We don’t know what it is about the park, exactly — the greenness or lack of buildings — that seems to improve attention.”

The fresh air, the sunlight, the scenery, the open space — there’s a lot about being outside that can inspire more activity, especially compared to the beckoning couches and screens of indoor spaces. All that extra movement adds up to tangible results: A 2008 study found that rates of overweight among children who spent more time outside were 27 to 41 percent lower than in kids who spent more time indoors.

Exercise itself is sure to reinvigorate you when you’re feeling sluggish, but fresh air can boost the effect. A 2009 study from the University of Rochester found that just 20 minutes outside can rev you up as much as a cup of coffee, The Telegraph reported.

“Often when we feel depleted we reach for a cup of coffee, but this suggests a better way to get energized is to connect with nature,” lead author Richard M. Ryan, Ph.D., a professor of psychology at the university told the publication.