In 2013 at the Texas Baseball Ranch, Dutch athletic trainer Frans Bosch delivered a guest lecture in which he referred to University of Georgia kinesiology professor Karl Newell’s theory of constraint training in motor learning. Bosch told the audience that altering one of three variables during practice improves the pace of progress. Bauer was listening closely. “It turns out the quickest way to acquire a new skill is to force yourself to do that skill with a constantly changing environment, implement, or activity,” Bauer says. “If you can vary one of those [elements] every single time, with
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