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Fast-twitch hand muscle exercises?

A friend who spent some time in the military told me about a silent language in which the hands are signed in short, rapid bursts. Really, really rapid bursts, actually. I've seen videos of both wing ...
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How to improve baby finger's extension and flexion? How to relax it? How to stretch it?

My baby finger has not become relaxed enough due to wrong technique in tennis, too much stress on it and more here. The only moment I can feel the toughness is when I am totally relaxed like after ...