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You'll be happier. Light tends to elevate people's mood, and there's usually more light available outside than in. Physical activity has been shown to help people relax and cheer up, so if being outside replaces inactive pursuits with active ones, it might also mean more smiles.
Your concentration will improve. Children with ADHD seem to focus better after being outdoors. It might be a stretch to say that applies to adults, but if you have trouble concentrating, outdoor activity may help.