The mainsite is not for the advanced; it's just dumb. They do a one-size-fits all approach that is totally random (no programming) and centers on the long chipper hero workouts which are too much for anyone, even the advanced people.

I recommend sites that actually to periodized programming with an emphasis on strength.

www.flatironscrossfit.com (my gym)

www.frontrangecrossfit.com (the gym that always kicks our ass in competions)

Also sites like

www.crossfitfootball.com (maybe a little too strength based for me, but their mission is different)

www.calalystathletics.com (oly focused, but still good).

The crossfit mainsite has scaled workouts. Go to the "Start Here" part of the website. Under that you'll see something about "Scaled Workouts." Click on That and it will bring you to a forum where they modify the wod for different levels of ability.