Michael this is one of those questions that if you ask 20 different people you might get 10 different answer's. I'd say that core work from yoga would be better but would be more long term if your enjoying the weight work is it not possible to do both? say some light weight's for 15 minutes a day when you feel like it and some time for yoga? maybe as your warm up for the running?
The benifit isn't just for your time just in case there are a few studites out there have have shone that if can help in both recovery and also preventing injury because of the houmones that can be the byproduct. That's from memery through so I wouldn't trust it 100%.
What is core stretching? Is it stretching, or core strength/resistance work, or both?
I don't mean this as a criticism, but is 4:24 for the marathon a typo? 3:24 off a 42.xx 10k is a good conversion; 4:24 off 42.xx would suggest you could do with a lot of long slow runs to boost your aerobic fitness!
(I really don't mean for that to sound as harsh as it probably comes over, honest!)
Having done a little stalking, I see that you did indeed do a 4:24, which, though it's a good time, isn't a great conversion from a 42:xx 10k. As an example, I have a 3:29 marathon off a 43:xx 10k... and I'm not really any more than an average converter.
Marathon running is almost all aerobic, whereas 10ks involve a decent anaerobic component too... and you're much, much better at 10ks than marathons.
This suggests that you're well trained for running around your lactate threshold, but haven't got as good an aerobic engine. Lots of long, easy running would hugely improve your aerobic base, which would ultimately mean you'd be able to run faster for less effort, thus improving your 10k too.
Or you could work towards another marathon and knock about an hour off your time...
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