While it may feel good to sink into a soft easy chair or sofa, it’s actually hard on the muscles in your back.
When you sit in a hard chair, your back muscles are supported, so they relax. In a soft chair, they must stay contracted to maintain your posture.
If you’re going to stretch out in a chair to watch TV or read a book, make sure you have good lumbar support.
Standing for 1-2 minutes for every 20 minutes in the chair will also help give your back muscles a break.