Extruding only extrudes in 1 direction I am trying to extrude the center of a barrel.



The model on the left side shows what it should look like.
The model on the right side shows how it goes wrong for me.
I would like to extrude to all sides so that it looks like the left image.
However, it only extrudes to one direction. 

I have also tried "e" and Alt + s, but that also gives me a weird result:


How can I extrude to all sides?

Thank you.
Press E, then S and then Shift+Z.