In the latest of her weekly journals, our Sport Academy runner describes her London Marathon preparations.
It's less than three weeks now until marathon day.
Paris one week, London the next. Havoc for training, though
The past week or so has seen me take on a 14-mile run, a 10-mile run and a whopping 18-miler.
I'm very pleased to have no major injury problems at this point. I'm hoping it stays that way as I build to 20 miles this week.
Experts say the last three or four weeks of training can play a larger role in deciding how you fare on marathon day than the previous 16 weeks of training.
I really should have had my last big run over the weekend, but I've been away in Paris (it's a tough life) so it looks like I'll have to squeeze it in over the week.
In fact it was exactly two years ago (as I write) that I was standing under the Arc de Triomphe in Paris and about to take on my first marathon.
That was such an incredible day and I'm hoping London will be too!
I have lots of friends who will be there to support me on the day and family coming all the way from Northern Ireland. I hope I don't let them down!
As race day approaches, and as training is supposed to be easing off, I can't help but wonder whether or not I'll be ready. Have I really done enough?
But self doubt doesn't get you anywhere.
Sunday 23 April looms ever closer for Rebecca
There is no point cramming training at this point as that will only lead to injury.
As marathon expert Hal Higdon says: "A flash speed workout with quick splits may look good in your training diary, but it could bring you to the edge of overtraining.
"The same with running the long runs too hard. Your time in the final 20-miler won't count three weeks later.
"Success will be measured by:
Finishing the marathon, if you're a beginner
Finishing it in a time that reflects your current capabilities, if you're an experienced runner.
"What you did while getting there doesn't count."
Do you have any questions about running the marathon?
If so, a team of experts from the English Institute of Sport are waiting to hear from you.
You can also visit the Five Live messageboards to chat with other runners about your marathon experiences.