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You don't socialize enough

While you may feel virtuous on your long solo runs, don't forget to check in with your pals once in a while. Studies suggest that social networks are good for your health too.

Try to schedule regular meet-ups with friends, whether it's a book club or poker—it doesn't matter. (No need to make it exercise-based, although that's nice too.)

Just connecting with other people, and maintaining those social networks as you age, is good for your health.

Next: You skimp on sleep