In the last post, I briefly described some situations where working for long time on computers is wreaking havoc on health. So, I am mentioning something from the last post itself. Never ever leave your legs hanging from the chairs. If you are not tall enough, keep a stool in front of the chair to rest your legs.
You might have noticed that there is a foot rest almost every where in the buses or flights or chair cars. That is not luxury but a necessity. Resting your legs on a little higher level than your ground does not put unnecessary pressure on the spinal cord and eases the blood circulation which stops when the legs are hanging. There is a lot of pressure on the lower spinal cord too when the legs are hanging. Even the hips hurt when you do that. And, kids tend to do this often. So, prevent that.