not so good to be back

I went for my first run today in two weeks because I had been sick for a while, and the time off took it's toll. I went to the towpath again, and got through about a mile and a half before I needed to walk or have my lungs explode. So I walked the remaining mile to my checkpoint, and then turned around started running back. I think I got about a mile, and then my lower back on my left side started tightening up and I had to stop again. For the remaining mile and a half back to where I started, I did a few sprints and some short jogs before my back tightened up again. So I was able to get at least the 3 miles that I was looking for, but it was definitely not the way I wanted to do it.