Tennis forehand backswing big? small? What should I do !!!

Hello! This is Monkey Tennis.

Finally, to make progress to Global Tennis, Monkey Tennis also edited English subtitles.
I made a video.

Please watch a lot.

In the future, existing videos are being prepared for translation work.
We look forward to your interest and support ^^

We will become a monkey tennis that always researches and strives for tennis development.
Thank you!