Generally speaking, the best practice techniques are those that lay down multiple, vivid memory patterns in the brain.

WSJ: The Wrong Way to Practice Golf | Golf Journal by John Paul Newport

Instead of vast maneuver grounds and lots of instructors and equipment, soldiers can train with small but high-tech gear such as Dismounted Soldier Training System, or they can practice techniques, such as squad tactics or IED recognition, using a training game on a laptop or even smartphones.

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"Back in the 1970s and 1980s we'd call this a career-ender of an injury, because doctors back then didn't know how to fix it, but we have better techniques and more practice at it, so we now call this injury -- even as horrific as it looked -- a 'career delayer, ' " said Webb.

CNN: Vonn's injury 'career-delayer,' not 'career ender'