Originally Posted by TennisCoachFLA
Using 2 hands on both sides like that helps him automatically engage the core more.
Some coaches like Dave Smith advocate starting all beginners with 2 hands on both sides.
This. When my son started playing, it took some time and practice to get him to swing properly and engage the core with a one-hand FH. My daughter is about 6 months into playing and using both hands on both sides, which from day 1 resulted in good shoulder turn and core rotation naturally.
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