<human>: The most I've run before is 16ish as part of my homemade training plan for a 1/2 marathon. I know that was more than necessary but I felt like doing it so I did. That was 6 weeks ago if I'm remembering right. Since then I've been running but I took a week break two weeks ago due to a pinched nerve in my back. 

Today, I bargained my friend that if he ran 6 miles, I'd run 20. I firmly believe I can do it, but the most foolish of men are the most confident, so I thought I'd ask people with more experience than I whether or not this is dumb.

For further reference/context, I've been running for about 3 months, and finished my most recent halfie in 1:56, comfortably.

Can you summarize the given text in a few sentences?
<bot>: Ran 16 miles 6 weeks ago, took a week break two weeks ago but otherwise continued running, in roughly the same shape, think I could give 20 a go?