They are opening and closing the fingers to enhance the bat "quickness" It becomes a "timing" device when coordinating with the top hand. The mind is also relaxed. When a hitter grips the bat too firmly, it will slow the hitter's reaction time.
When our American "Area Code" teams played the National High School Team of Japan, I had the opportunity to study the teaching methods of the Japan Coaches.
The practices were extremely detailed, [defense & offense]. Morning and late afternoon. Young hitters need to teach themselves by watching and studying the great hitters. Go to "U-tube" and study Hank Aaron's swing.
I thought you might enjoy this documentary which is partially produced and is narrated by a family friend, Kerry Nakagawa. Amazing history about the love of the Japanese and especially the Japanese Americans for our national game. Very interesting comment early on about how the Japanese were attracted to a game where 9 minds act as one, even when the game is played behind barbed wire.
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