This. It's free (or cheap), easy, and is good for your health (and not just because you are taking a break). I've been doing this for over 10 years, starting

This. It's free (or cheap), easy, and is good for your health (and not just because you are taking a break). I've been doing this for over 10 years, starting from when I realized that I was getting sicker and more unhealthy just sitting at my desk for extended periods of time (> 4 hrs straight).