Göteborgsvarvet

That's how it looks when someone ( in this case me) runs 21km without any training. It was a desaster!!!
The top graph is the heartbeat that goes down the longer I run. at the end you see it is going up and down a lot. That's when I had to walk in between.
The next graph below (the dark one) is the altitude. As you can see it's not a very flat race.
And the blue graph represents the speed.
As a conclusion I can say it makes definitely sense to do some exercises before running a half-marathon!
I might upload some real photos during the next days...