The point is: having another fundamental class of postures available - in this case "lying" (in addition to sitting and standing) - increases our flexibility (a

The point is: having another fundamental class of postures available - in this case "lying" (in addition to sitting and standing) - increases our flexibility (and potential for respite) by approximately 33 percent. For people suffering from severe RSI -- especially those for whom essentially any amount of sitting in one class (say "sitting"), even in difference positions within that class -- becomes unbearable for more than an hour or so -- then this 33 percent can be of significant impact. Also - for some people standing just doesn't work (for more than very short intervals). So in fact the lying option provides significantly more respite potential (50 percent).