Sorry, I save my knees now for hiking and climbing. My suggestion is to never let more than two days in a row go without a run, also find one of the many training regimens out there and faithfully follow it...lastly, make sure you do at least one 20 mile run before the big day, but not too close to it.

Paul, got your note but didn't know how to reply until now. My marathon days are over, I save my knees now drop