.....yeah so lets get this thread back on track....
polish, i have noticed those things as well. for the past year and a half i have done relatively little stretching, however my hip and hamstring flexability is better in some planes than when i played football. wide stance box squats in general have played a large part in that.
mike, with sitting back if you find your self having trouble sitting back far enough you can start with a higher box and gradually work down until your hamstring flexability is up to par, and allows you to sit back on a lower box. keep in mind that you can sit back too far. when you get to the point that it is very difficult to go back anymore, flare your knees out to get to the box.