I can tell you that people that stay only its 8 hours of work in front of a computer develop many diseases that impact to their lives forever. There is a testimonial from a man that tried to commit suicide but he could not pull the trigger because he developed a disease that attacks his fingers. So, you can see that is very important for you to achieve a higher level of life quality.
I practice swimming three times a week and running four times a week. Also, play basketball when I can. Here you can see a picture of me running. I suggest you that invite your colleagues and try to do some sport. In the beginning, if you go alone, you will go back to what you are today, a sedentary person!