I read some of the comments to this guy's blog post (http://paulm.com/inchoate/2005/01/kettlebell_pushups.html). This one cracked me up:
"Nice one , I like it.
I got a good one for you, WHy don't you Make a strap
to go around you balls and the other end to the kettlebell. Then do
squats. This will streghten the internal organs. But be care. lol"