Dear Chiharu,
Please click here to review my analysis of your forehand. The lessons recommended to study are:
1)https://members.tennisevolution.com/topics/hold-the-finish-11/
2) https://members.tennisevolution.com/topics/build-the-foundation/
3) https://members.tennisevolution.com/topics/2-hot-tips-3/
4) https://www.youtube.com/watch?v=OFjpTYWez94
5) https://www.youtube.com/watch?v=CFSIPqltuuk&t=9s
Regards,
loom.com
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Herman Krackow,
Head Coach