Let me be brief, no really - I can be.
   I have seen a commercial that begins by explaining how sitting for long periods of time can make one's buttocks and back ache.  It shows people rubbing their backs and highlights these areas with pulsing red colors, indicating pain.  The solution?
A specially made padded cushion to be used while sitting at one's desk or in a truck (long haul truck drivers).  The special pad is meant to make sitting for extended periods of time (i.e. hours) comfortable and thus possible.
  The ad doesn't talk about the health consequences that research suggests befall us when we sit for more than 60 minutes at a time (regardless of how physically active we are the rest of the day).  There is no comfy cushion that prevents metabolic dysfunction caused from sitting too long.
NO - we don't need THIS cushion.  Here is what we need.
A comfy seat, sure, but one that is fitted with a special one hour timer that gives you a shocking JOLT of electricity any time you sit on it for 61 consecutive minutes.  YES?!