求翻译：Some athletes trained in the full pullup find this exercise difficult, because during close pull-ups the arms try to pronate (turn inwards) as you pull. Sometimes an overhand grip limits this natural twisting motion. This is a good time to experiment with your grip; try a side on, or underhand grip. Experiment with ring work if you can (see page 118). See what works for you. If strength is a problem, continue with full pullups, bringing your arms an inch closer every workout or so. Over time, you'll master the close grip.是什么意思？

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