You've moved to New York City and you have to get to work by subway. It's not possible to get on the trains during rush hour. What do you do?

[edit] Steps

Learn where the cars stop and where the doors open
As the train rolls into the station, each car filled with wall-to-wall people you position yourself close to where the door opens.
Let the people off. It can't hurt.
Slowly turn so that your back is to the open door.
Hook your feet over the threshold of the subway door and bend over slightly
Slowly move into an upright position. Congratulations. You are on the subway. Of course now your troubles are only beginning in earnest.

[edit] Tips

This works because socially, it is pretty darned impossible to face a wall of people and push yourself onto the train. They will sense this as a hostile or aggressive act. But with your back to the human wall they will move, or sway back as you straighten up.

If there is an empty seat on a crowded subway car, check before you sit there. Maybe just don't sit there. Also, if a train pulls up during rush hour with an empty car, don't get on that car.