How to walk more
How I did it: I tracked my number of steps over three ordinary days, averaged the results, and plotted a gradual increase from that number to my goal (10,000 steps per day) over the course of six weeks. I tried to hit my daily quota without going too far over it, and my legs slowly grew stronger so that I can now walk 4-5 miles a day without undue fatigue. Now I just have to keep at it!
Lessons & tips: Be conservative at first, and let your body adjust to the new demands on it.