The best way to transition to running is through a Couch to 5K program. www.sparkpeople.com/resource/fitness_artic
These programs work through progressively increasing intervals of running and walking.
The impact of running is hard on the body, and most experts recommend rookie runners (anyone with less than 6-12 months running experience under their belt) run just 3 times per week. This doesn't leave a whole lot of time to train and prepare if your run is in 2 weeks.
I'd also recommend keeping your running speed down (less speed = less impact) and at this stage it is more important to get used to the motion of running, rather than worrying about the speed.
Given you have so little time to prepare, you may want to consider including a couple of walking intervals in your charity run, to make things a little easier on your body.
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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