When I read the headline I thought you had lung problems :( I think I am overly fixated on that). The people I know that has run a marathon was really exhausted, but 20 km is a good distance. I have never run it but walked it quite some times. Finding a pace is the most important.
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I may have been overdramatising it. As someone who want into exercise for a long time I'm experiencing some interesting stresses on my body. Having an app is good as it encourages you to keep going. I know I can't expect it to be easy.
When you move up in activity it can be felt :) I am going through something similar with my 1,5 hour exercise a day plan. I do not use an app and to begin with I kept it very simple going or cycling the same routes every day. But now that I know that my average waling speed is 5.5 and cycling speed i 16-17, I use online maps like google and openstreetmap to make more interesting destinations. I want it to be part of my daily routines like it was 1.5 - 2 years ago so I do not stretch myself too much. But a half marathon is likely to hurt a little :)