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DIY Kettlebells for under $10
Wrapped nylon rope through the handle; this hangs down into the cement adding that extra bit of hold and safety. Filled the ball on top of a scale so I could get the weight I needed. When it cures, concrete will lose only about 4% of it's wet weight. Made my finished kettlebell come out to exactly 25lbs (11.3kg). Since I had some pvc,concrete, bolts, and rope laying around, my costs were $2.95 for the thrift store basketball and $0.99 for the cheap black spray paint.
I just made three with one bag of concrete and 3 balls I picked up at the the local goodwill. I didn't use PVC though. I used some left over electrical piping that I could bend/shape. I screwed in a couple screws at the end too. I haven't weighed them yet but guessing they turned out to be ~5 lbs, ~10 and 15 lbs. I had some trouble completely filling the large basketball. The top kept folding over.
Get some steel cable (aka wire rope) and run it through the handle and into the concrete. PVC is too fragile for years of weighted swings and snatches. If that handle breaks at the wrong time, it's a potential injury.
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