Stretching before lifting?

[Sawol]

Specifically, I'm wondering if it's okay to stretch my hamstrings before deadlifting.

I've found that keeping my back ''rigid'' is easier after some stretching.

Is this okay to do?

[Mark Rippetoe]

I do it, because my hamstrings are tight enough that I have to before I can get in a good position to pull. Stretching for athletes that are already flexible enough is a waste of time and is detrimental to power production, but for someone who needs to stretch before a correct position can be achieved it is essential.