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I'd stick to the plan, continue to train according to the correct effort levels (e.g. your MP sessions according to HR), and take advantage of the improved fitness to see if you can reassess HM race targets, which in turn can give you confidence for the marathon target. If things are still going in the right direction by end of Feb, maybe think about tweaking things then.
On the subject of core/strength exercises, someone reminded me about the Nike Oregon Project core stability routine, which I intended to start incorporating into my gym routine as of this morning. So I turned over in bed instead. :) As an excuse, I think I'll try a few out at home before today's easy run, while I've got the videos in front of me for reference. Then on Wednesday morning I can scare everyone in the gym with my Hot Salsa. Looks like some good functional moves going on here.
last week was a complete dream week of running, both timed threshold runs I went faster than I thought possible, had to skip the last km of Fridays easy run as I had to get home, then managed a very respectable run off the bike after very hard bike threshold session, and Sundays 10 miles at marathon pace my HR was 150avg by 6 miles (threshold is around 175) so pushed on a bit and averaged 4:10 per km.
not sure how to feel about it though, it's great to feel this peak in form, but at the same time I'm a long way away from my goal race (Brighton marathon) and I don't want to peak for my warm up half marathon races and fall flat on my face at the marathon again, should I just enjoy it for what it was, and stick to the plan, or increase my training to increase the load..?