After 3½ years exclusively focussed on triathlon and more specifically Ironman, I'm switching my focus back to marathon running for the next 18 weeks. The target race is Rotterdam on April 8th where I hope to run under 2 hours 35 minutes. Depending on how training goes, I might lower that target. But right now, I don't feel like I can be anymore ambitious than that.
I'm going to follow an 18 week, 70-85 mile per week, program from Pfitzinger and Douglas. I followed the exact same program back in early 2014 and that April, I ended up running 2:35:51 in Connemara off the back of the training. (Log is here;
https://www.boards.ie/vbulletin/showthread.php?t=2057105129 and race report here;
https://www.boards.ie/vbulletin/showpost.php?p=93473643&postcount=136, for anybody who might like to read either.) I was very happy with this result, but I often wonder how much quicker I might have been on a faster course. I always intended revisiting the same 18 week plan I followed back then, but picking a fairer marathon course to finish off on, to see exactly how fast I could have gone. I finished a long term Ironman goal in mid October and I'm going to take a step back from triathlon for a while. So now is the best opportunity I have had in four years to test out the program once more.
I definitely think I'm a stronger runner now than I was when I started training for Connemarathon 2014. However I don't feel as ready for the high mileage that's demanded for the next 18 weeks and I might be running a small bit of a risk in what I'm about to undertake. Although I've gotten through this high volume program before without issue, I haven't adequately built up my weekly distance over the last number of weeks. As a preventative measure, I might start off doing some of the recovery runs on a cross trainer and hopefully come the end of January, I'll be comfortably coping with the full on 7 days a week running. I like to think I'm resilient enough, but I'm not invincible and picking up an injury only a few weeks into the training, is something that worries me. To lessen the likelihood of that happening, I'm going to seek out grass to run on as often as is practical.
Right now, I don't think I'm capable of holding my interval or even my threshold pace for any sustained length of time. Even running my hoped for marathon pace of

:40/km for just 10km seems daunting. We'll wait and see, but I might have to adjust my training paces accordingly for the first few weeks of the program.
My head space just isn't where it ought to be right now. It's just over 7 weeks since I finished the Ironman World Championships in Hawaii and the motivation to get back to focussed and consistent training hasn't yet returned. I'd prefer another few weeks prep, but unfortunately Rotterdam Marathon is when it is, and I'll just have to come to terms with this from the off. I'm fully expecting these first couple of weeks to hurt (a lot), but they'll also be the kick up the hole I badly need.
In addition to the run training, I'll continue swimming and without detailing it here, I'll log it as cross training. On top of the running I was doing when I set my PB of 2:35:51, I was also swimming 4/5 times a week. I was swimming purely for the sake of triathlon, but I think I underestimated how much of a factor this was in getting me marathon ready. I'm far from being an amazing swimmer, but I've mastered it to the extent that I can get a good aerobic workout from any time I spend in the water and it will once again serve as useful cross training. I won't routinely schedule swims as as I will runs, but both swimming and whatever cycling I do between now and April will serve to boost my engine between now and Rotterdam.
Lastly, I'm as inflexible as a plank and even at the best of times, my approach to strength and conditioning has been pretty hit and miss. But I'm planning to change. I've started doing Bikram Yoga and even though I find some of the postures almost impossible, I am starting to notice an increased flexibility. I'll continue with that once or twice a week, while also including some sort of weights' work.
That's enough warbling for the opening post, I've already started the plan and I'll be back next week with an update on how the first week went.