Do you think the trireme of revolution can propel itself to victory? Nay! Without our daily diligence, our sweat and concerted labor, the ship of liberty will stagnate in the doldrums of liberalism!
Get on that rower and push yourself, for yourself and for all our futures!
And make sure to stretch! Stretch before! Stop 10 minutes in and stretch again!
How do I build upper body strength from literally nothing?
get on the rowing machine and set the resistance to the highest you can manage without hurting yourself and go from there
and/or do some pushups and dumbbell exercises with light weights and then get on the rowing machine, but I mean like the minimum resistance on the rower is so low I think anyone who can move their own arms can manage it
if regular pushups are too difficult you can do them from your knees instead of your feet (called modified pushups) which reduces the weight/increases your leverage (which means they're not as good for building strength, but if you gotta start somewhere then hey. The important thing is "do you feel strain from doing this" because if Yes that means you will get stronger from it eventually)
and most importantly good luck and remember to just stick with it. Exercise is hard and doesn't feel great, but it's important to take care of yourself, and if you commit and dedicate yourself to a sufficiently strenuous workout routine I promise you will see results in the mirror and in how you feel within like, a month at most. They might not be significant changes like "woah I'm jacked" but you will see progress and that'll help keep you going
godspeed