Let me tell you a story. I have a friend. He was hired in an industrial complex, doing a lot of hard work, moving stuff, building, most of the time outside, in

Let me tell you a story. I have a friend. He was hired in an industrial complex, doing a lot of hard work, moving stuff, building, most of the time outside, in cold. One day he got fired, not his choice. After some time he found a nice job, this time in an office. He was working 100% from the computer, managing some stuff, and sitting all day. In the first month he was amazed what he missed, the calmness, it was always warm, no physical labour, etc. I met him after 3 months there. He was the most depressed person I ever met. What happened? Lack of activity.