Street Run (parkrun) 32:05  5.0 km (6:25 / km) shoes: ASICS Lyte 33 (blue)
It wasn't pretty, but nothing hurt and I only had to walk once.
Step Into Life (powerflex) 1:00:00  shoes: ASICS Lyte 33 (blue)
And that was probably the hardest session that I've done all week.
I've probably jinxed it now, but my back is actually feeling okay. As in not-sore. I had a couple of bad days while I was away (probably too much walking on hard surfaces with a backpack), but nothing all week.
Exercising in the mornings probably helps - not having to put any pressure on it after sitting on my arse for 8 hours.