there are many great tools for training the body and mind - barbells, dumbells, heavy bags, jump ropes, sandbags, rocks, javelins, hammers, saws, oars, knives, rings, pull-up bars, bicycles, skis, water, trampolines, etc., etc., etc., heck, Milo used a bull… oh yeah … and kettle bells. if the time is not taken to learn how to properly use these tools, injury is a likely result and, as Pavel says, there is no one to blame but yourself and you especially should not blame the tool. squats are bad for you knees and back if done improperly, great for both if done correctly. overhead presses are bad for your neck, shoulders, back and wrists, if done improperly, great for all if done correctly. everything done improperly carries the risk of injury and/or lackluster results. this article makes baseless claims and discredits the writer.
this discussion page is obviously filled with people who take kettle bell training seriously, so i suspect this article will raise a lot of eyebrows, but i wouldn't expect many comments, as its a waste of time.
by the way - the header this guy uses for his webpage has a silhouette of Steve Reeves next to the name of the site - Reeves was an avid kettlebell enthusiast - enough said.