What posture does ‘sitting’ entail? I read somewhere the least pressure on your spine is when your torso/legs are at 135°. I can confirm this from personal exp

What posture does ‘sitting’ entail? I read somewhere the least pressure on your spine is when your torso/legs are at 135°. I can confirm this from personal experience. I spent the entire pandemic, i.e. almost two years, working from home from a chaiselongue that a friend of mine produces [1]. I only ever used it for reading books or watching movies via my projector before that. It turned out it is perfect for doing computer work. The angle of legs to torso is between 130–140° on this piece of furniture. I never had any fatigue in my spine, pressure points on my body or pain from tensed muscles anywhere. We're talking up to 12 hours/day on this with two 1h breaks in-between for lunch and dinner. I always used my laptop but now I am building a setup with a wall-mounted arm to hold a screen and keyboard, below, that I can fold away. I will post here once I have it set up. [1] https://www.saschaulber.com/shop/coffy/ https://www.saschaulber.com/shop/coffy/ – it's currently unavailable because of post-pandemic related supply chain problems