Our expert says:
Definitely, you can. Obviously, it's a major challenge, but one of the best things you can do is find a goal, and that's what this is.
Four months is enough time, but obviously you have to use it wisely - you can't afford to start, run for say 3 weeks, then get injured or sick, lose 2 weeks, then start again, and so on.
So it's important to get onto ONE programme, and then be controlled in your preparation.
Here's a link to a programme that will take you to 10km in 11 weeks. However, I'd suggest that you cut it to 10 weeks, by skipping out week 2 (it's very gradual at the start).
Once you've done 10km (which will leave you 5 weeks), then you build towards 21km, and that's not too big a step up, provided you are sensible about pace and when to walk.
So first aim for 10km, by the middle of February, and then take it from there!
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