A Word of Warning

Do not under any circumstances stand up suddenly after sitting for 15 minutes on the edge of a stool idly websurfing.

FYI
a) - it is possible to pinch the femoral artery and cut off blood supply to your feet, thus making them temporarily numb.
b) - in this numbed condition standing suddenly becomes much more of an active sport, especially as that feeling of pins and needles comes back you soon find yourself hopping around yelping.
c) - do not do this new form of aerobic exercise in front of customers - as amusing as it may seem later, it only makes them think you a moron and possibly deranged.