I be look around for a nice set of adjustable weight for p90x as my spin lock be take far too long to lock and load for the quick , fast paced weight switch that the program demand . and so after much hesitation from my wallet , I finally give in and order the PowerBlock Classic Adjustable Dumbbell set . boy , let I tell ya , worth every penny ! I be finally able to keep up with all of the work out with only the slightest effort on my part . go be the day when I have to constantly pause and rewind to stay on track . it almost make work out fun -lrb- if that be possible -rrb- , haha . they be so good in fact that if I have to choose between these weight and a girlfriend , I would choose these weight ! you know why ? because I would be so psyched to work out with these dumbbell everyday that I would get rip in no time at all , which mean a even hotter girlfriend ! ; -rrb-