Maybe this is a stupid question but....

What is the difference between chin-up and pull-up....

I found that for the descristion of the 2 excercise on this web site : http://www.exrx.net/Exercise.html


chin-up : Preparation

Step up and grasp bar with an overhand wide grip.
Execution

Pull body up until the chin is above the bar. Lower body until arms and shoulders are fully extended. Repeat.

pull-up : Preparation

Step up and grasp bar with an wide overhand grip. Step down onto assistance lever or platform.
Execution

Pull body up until neck reaches the height of the hands. Lower body until arms and shoulders are fully extended. Repeat.

....this is the same thing ??!!

what is the difference...?

P.S. sorry for my english