From the interview with John Little on Conditioning Research(http://conditioningresearch.blogspot...hn-little.html):
Yes, kettlebells do provide resistance to your muscles, but so does a bucket of rocks, with the difference that you can vary the resistance with a bucket of rocks, thus making it a more practical exercise tool than a kettlebell.</blockquote>
Anyone ever did that or though about doing that? I mean, it would be way cheaper and probably work out exactly the same way as normal kettlebells.
Maybe this would also be something for another MDA DIY workout equipment post after we've already had sloshtubes, medicine balls etc.