Adding 10 miles from this morning- total now is 566
Re combining strength and running, I do it, but doing a lot of heavy lifting does slow you down. Therefore, if you're aiming for a fast time it's probably best to stick to bodyweight strength training. If you're just trying to get round the marathon course in a reasonable time, then the benefits of the strength training may well outweigh the time loss, so it comes back to what Suzanne says- yes, it's possible to combine, but it's difficult to reach your full potential in either if you're doing a lot of the other.
On that basis, it's important to be honest with yourself about your objectives. Personally, the difference to me of placing 6th vs 10th in a trail race is worth less than looking hot in a vest and so I just carry on lifting
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Also, what recovery work are you doing? - I drink whey shakes and eat a banana straight after lifting and after any runs longer than 10 miles- I used to be a bit sneery about protein supplements but they do help if you're training every day- and I also use a foam roller in the evenings on my quads, glutes and IT bands.
Finally, if you're running after a heavy lifting day, start off nice and slowly and give your body time to loosen up- my first 2-3 miles were a bit of an effort today but then I loosened up and was fine and carried on to 10 with no issues.
HTH