Gesture for "back" instead of back key on bottom right?

[Sharondippity]

I'm a lefty on my cell, and would like a gesture instead of having to use my right hand to go back a step. I couldn't find it online, does anyone have a tip for this?

 

[kris.richards]

hold s-pen button and draw a "<" pattern on the screen. starting with the top

EDIT:As for doing that with your hand, probably would need a launcher like Nova or Apex