"New range is weak range." For those that are experiencing any tightness, read this article by Roger Harrell. Making improvements to flexibility is a long term progress and requires consistency. Take an extra 15 minutes in the morning and at the end of your workout to spare yourself some of that tightness that you would normally feel over the next couple of days.
Stretching and Flexibility by Roger Harrell
This article was originally published in the CrossFit Journal Issue 41 - January 2006.