Looking for an inexpensive option, I ran into an article posted to a CrossFit forum (http://www.crossfit.com), which provided details on how to build an inexpensive Kettlebell. I have since built 5 Kettlebells of various weights and have been extremely impressed by the durability of the product as well as the options we now have when working out at home.
Kettlebell exercises employ a wider range of motion than traditional dumbbells and typically involves swinging and explosive movements that utilize the full body. Because the weight is off-center from the handle, the movements demand greater stability and really target the core muscles.
Step 1: Materials & Tools
-1 bag quikrete pre-mixed concrete mix
-1 cheap rubber ball (under $5)
-26" of 3/4" or 1" PVC (sch40)
-Small quantity of sand
-1 Hacksaw or Jig Saw
-1 Heat Gun or Oven
-1 Bucket (for mixing)
-1 Small Garden Spade or similar tool (for mixing and transferring concrete to the ball)
-1 Pair of Scissors