Building Endurance

I was just wondering what exercise will help build my endurance for running. Would the elliptical machine or stair stepper best the best way?
 
I've have noticed that pretty much any cardio will help in running. I had about a month where I didn't run at all (I've ran on and off for 4 years and injured my ankle playing basketball enough not to run). I did hit the exercise bike hard that month though and when my ankle was ok to run, i picked up right where I left off.
 
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