Kristina if I thought having a bad back would get someone else to look after the toddler I'd be shuffling around wailing and clutching at it 24hrs a day...they don't seem keen 
I don't think it's an injury in particular, Fish, just general life things toddler and running inclusive. Hmmmm. Ibuprofen is a good shout, I'll probably just go for a walk later to keep it warm.
It's not debilitating, just so annoying
especially as I wanna add some ks to our total!
Thanks for the advice and sympathy