A proper Kettlebell Swing requires a forceful contraction of the posterior chain to drive the bell forward and completely open the hips. Great job, Marcos! “The primacy of core strength and conditioning in this sense is supported by the simple observation that powerful hip extension alone is necessary and nearly sufficient for elite athletic performance. That is, our experience has been that no one without the capacity for powerful hip extension enjoys great athletic prowess and nearly everyone we’ve met with that capacity was a great athlete.” http://crossfit.com/cf-download/Foundations.pdf
