How do you get to Sabrina in the Saffron City Gym in Pokemon?

When you enter the gym take the warp spot.

Now take the bottom left warp spot.

Bottom left warp spot again.

Now take the top right.

Bottom left once again.

That's Sabrina.

To get out; take the warp spot again.

Get the bottom right.

Bottom Right again.

Top right.

Bottom right.

You're out of the gym.