
From the site:
"Prolonged sitting can also cause poor circulation in the legs resulting in painful leg cramps or the sensation of the legs falling asleep.
The ErgoChair enables individuals to achieve proper posture. The egg-shaped flexible ball allows free movement of the body - up and down, back and forth, and side to side – for the body to find the best posture to relieve and prevent back pain."[1]
1. Doctor Riter's ErgoChair