We stand on a regular basis.
Before doing this we discussed which leg we would start to stand on. Do you start on the left or right? [We have chosen the left leg] I then say "stand" as the left leg is coming around to perhaps the 3 o-clock postion.... then we stand together the next time the pedal comes around to that same posistion.
I will sometimes rock the bike slightly. It is important that the stocker stay loose, and not fight anything. It is nto anything terribly difficult to do, but one wants to be quite comfortable on the bike before hand.
glenn