Always working on the computer means an unhealthy sedentary lifestyle. No exercise not only makes us overweight it also weakens our muscles. Many of us try to develop an exercise habit and we can even follow through a few days or even a week and then, we miss a day, and then another day, and then another, and finally the next year when we are making the new resolutions we realize that once we had resolved to exercise too.
A regular exercise habit is not as tough as it seems. You need to take small steps and you should keep the doors of your expectations department closed for a few weeks. Zen Habits has just published 4 Simple Steps to Start the Exercise Habit.