McFadden to not run at combine?

What is there to ain from not running at the combine?

Quote :

McFadden won't do much at combine

Albert "Einstein" Breer called to
breathlessly report that Arkansas RB Darren McFadden said he won't run
at the scouting combine and hasn't decided whether he'll do any
physical activities.

http://cowboys.beloblog.com/archives/2008/02/mcfadden_wont_do_much_at_combine.html