Could you elaborate on “Toastyour muesli”? What do you mean? Do you put it in a pan?

Yeah. “Calories in calories out” is correct in theory but it is an oversimplification. Most people burn a vastly majority of their calories “at rest” by just maintaining their body temperature.

Running. I’m pretty fit and I work out (retty much only bouldering tho). Despite running on average once a month I can run a 45 min 10k. I think if I actually trained for running I could be pretty good but I just prefer climbing as a sport.