Another reason to take your workout outside the gym at least sometimes: Research shows that the awe you feel when you experience nature’s beauty can also help your immune system stay strong. Science has long shown that exercising outdoors produces a boost in feel-good hormones. Now a new study published in the journal Emotion found that these happy feelings are also linked to lower levels of pro-inflammatory cytokines, proteins that signal the immune system to work harder, possibly wearing it down. And when your immune system operates at an optimal level, you’re better able to ward off diseases and stay healthier.