Water Jug Workout

I remember as a kid reading some article in Boys Life or other Boy Scouting literature about tips and tricks for exercising around the house.  Little things like crumpling up all of the newspaper in to tight paper wads I still remember.  It also spoke about using water jugs as free weights.  The idea must still hold merit, as this months Dirt Rider magazine has a page spread about using a water jug in exercise routines!!  Well I finally had a chance to create my own version - filling milk jugs with concrete!  Water weighs 8.3 lbs a gallon, and my concrete jugs measure in about six pounds heavier.  Plus I don't have to worry about them exploding water all over (I am terribly clumsy / unlucky).  So I have added these ghetto-weights to my daily regimine.  Making the concrete versions was super messy, so maybe a simple water jug is the better 'laymans' thing to do.