Our expert says:
Good for your colleagues! Just kidding, but it's great that you have a goal to get fit for!
I'd say the 6 week programme is actually a good place to start, but you'd have to jump straight in at week 2, and then go from there. The thing is, if you can walk 5km, then you can do 7km in a group activity - you'll find that you have the capacity. The key is to start - if you hesitate and oscillate while trying to decide, then the chances are you never get going. So the first step is most important. I'd say take it by following that programme, and then let the rest play out.
You might find that in 3 weeks, you're coping very well, and then you jump across to the 10 km programme, and follow that, starting in week 5 or 6. That's for later. For now, I do think that programme is the best one to begin with!
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