suzanne hope the butt ache disappears soon
"junk miles" means miles that dont do anything to further your training objectives (i.e. usually easy paced shortish runs). Everyone does some (because they're really nice and sometimes you just CBA or you want to run and chat) but it's more a recognition/reminder that it's not just all about the distance and not all miles are created equal- for example, for me, it's much better to do 50k and +10,000m ascent than 80k flat, (it's taken me 2 years to realise that-duh) It's not really a disparaging term, more just something runners might refer to, like "Great mileage last week", "Yeah, 20 junk miles in that though. Gotta do some hills this week." Also, for people who are injury prone, or lack time, and who aim to do as low mileage as possible to reach their objectives, they need to be ruthless about eliminating junk miles, which I guess is where they got their name. If you're running for fun, or general weight loss/ fitness are fairly bomb proof and have lots of time then they're not really relevant.
Anyway, happy to add 12 miles from this morning (big hill session +1200m) to make 447.34.
Welcome back kimmi. Hope the club run goes well.