Overhead squat 1-1-1-1-1 reps
Front squat 1-1-1-1-1 reps
Back squat 1-1-1-1-1 reps
Try to increase the load on each of the fifteen sets.
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The topic of the relative merits of the kipping pull-up comes up regularly on the CrossFit Message Board. This thread contains nearly ten pages of thoughtful posts on the subject: http://www.crossfit.com/discus/messages/22/8991.html