Try and jog ?!?

It was cold cold cold and I had a slight strain in my left calf. "Take this one real easy" I said to myself. I walked up and down the street a couple of times trying to warm up a bit or getting the calf to feel any better.
"Bugger it" I started to jog and in my head wanted to do about 5:30/k or slower.
At about 3k the calf felt warm and the strain disappeared. I didn't want to see my pace but had top pull myself back on the flats. I could feel my legs wanting to stride but I kept them short.
Dam it was still cold and the odd breeze would crawl around and go down my back.
6k and I was feeling better and still holding the legs back.
Home in 8.5k and to my surprise 5:08 pace ?
It honestly felt like a very easy run and I supposed it was not a long run and these days anything under 10-12k doesn't count as a run.
Oh well maybe a rest tonight or stretch the legs again with a jog ?
Take care