I really don't like sport, but I have to do something useful because I work at home. I sit at my computer for 7 or 8 hours every day. How can I help my spine? It's stretching for 2 or 3 times a day.
The easiest version: you have to tilt your head, cross your palms on the back of your head, and press. The head must resist the pressure of the palms for a few seconds. Fine! It's easy and very effective for the spine.