Rhythmic Tennis Serve_PRO (Android-Application) by Kenichi YUMINO(Ph.d), Japan [YUMINO Institute of Education] How to Buy the Application from Smart_Phone
Two types application of gRhythmicTennisServe_PRO(Mail)h and gRhythmicTennisServe_PRO(NoMail)h are released in gGoogle Play Store.h
How to Buy:
Click gPlay Storeh -> h Google Playh, and put into gRhythmicTennisServeh in slot.
You can see below two applications. Please select one, and pay to it.