Yes, but I'm a developer, why would I need more upper body muscles? My daily activity doesn't require some more particular strength (although I wouldn't consid

Yes, but I'm a developer, why would I need more upper body muscles? My daily activity doesn't require some more particular strength (although I wouldn't consider myself weak either), it's more about endurance. I've enough core strength to not have any back problem too (I avoid sitting on a chair though, but rather lie down/stretch out in front of my laptop)