Been coding for more than twice that, and I must say, you lost me with the "no slouching" nonsense.
There's nothing wrong with slouching. Ignore what you're mother told you. If you enjoy hunching over a monitor and letting the world disappear to a multi-hour coding session, keep it up.🙂
https://carlynbeccia.medium.com/research-finds-slouching-isnt-bad-for-your-back-9a8b879d2023