Left-hand tension: sometimes you know it's there and sometimes it goes undetected. But either way, it eats away at your playing. You may notice that passages just won't get faster no matter what you do. Or your left hand and arm may tire out during pieces. And of course, if it goes unchecked, tension inevitably leads to injury.
The answer is to play at all times with the minimum necessary finger pressure. Minimum necessary, that is, to stop the string fully. Easier said than done?
Here's a quick method that you can use as a warm-up or to fix specific passages. It just takes a minute, and I demonstrate it here. Thanks again to Simon Fischer for inspiring this solution!
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