walking faster is the simplest way of adding intensity to your walking. But once you get to the point where you have maxed out your walking speed, there are other options.
The first is to add some hills to your route. The second is to carry some additional weight in a backpack or weight vest (hand and ankle weights are best avoided, as they stress the joints in ways they are not meant to be stressed).
The impact of running is hard on the body, and it takes a while for the body (especially the legs) to adapt. Walking is a good start, but you should build up a solid base (3 months at least) of walking before trying to run. When it does come to transitioning to running, I would strongly recommend a Couch to 5K program. Rather than running continuously, these programs work through progressively increasing intervals of running and walking. www.sparkpeople.com/resource/fitness_artic
Most experts also recommend keeping your running to just 3 days a week until you have 6-12 months running experience under your belt, as it is on non-running days that your legs recover and get stronger. It is fine to do lower impact cardio (eg. walking) on non-running days.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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