Thanks for all the tips. I think 'm going to sack off (attempts at) running completely. I feel like it's a basic thing one ought to be able to do to have any reasonable claim to all round fitness, but otherwise it's not important to me and I've never enjoyed it that much.
Will stick to biking & hiking, which seem to be enough to maintain a reasonable level of aerobic fitness - I have a couple of time trials I do every few months on the local hills, steep uphill hikes with a pack (simulating alpine approach marches) and on the one I did last week (640 metres height gain / 66 minutes) I was two minutes slower than last year but with a heavier pack this time. So it seems like I don't *need* running.
The waking up in the night with calf (and - oh joy - since last night now also shin) cramps after climbing is getting to be a major pain though. I'm trying to drink more water, in general and esp. during & after training, and I'm foam rolling & stretching, though not as diligently yet as I should be. Hope this will eventually bring some benefits.
