Hi lisalris, the original challenge was to walk 100 miles, some of us completed that challenge and then continued the habit. It encouraged me to make a change in my commute to work, I walk instead of getting a second train for one stop. It soon adds up, 3 miles a day. Then instead of watching my son do his rugby training I walked round the block a couple of times. This all progressed to jogging, which progressed to a bit of trail and road running. You never know where it could lead you. Why not set yourself the challenge to walk 100 miles by a certain time? Work out where and when you can fit it in your daily/weekly routine. It might become a habit. Most enjoyable in the better weather!