Pasternak also warns that good technique is especially important because there's a greater risk of injury. Slow-speed lifting of traditional weights involves easy-to-control movements, but with kettlebells you're swinging and bending and lifting the weight quite rapidly. Truthfully, there were a couple of times I worried I might bonk myself in the head and wind up spending my days on the couch giggling through reruns of "I Didn't Know I Had 19 Kids and Counting" on cable TV.
Pasternak sees kettlebells as best suited to conditioning competitive athletes. "For 99.9% of the population, dumbbells are a more effective tool than kettlebells," he said.