When playing tennis, the arm is used as a 3rd class lever. Also, you can research how the human body reacts to such strenuous sporting activity.
It's a subjective measurement made by the manufacturer. There is no scientific basis to the figures.
Trampoline Tennis Table-tennis
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Tennis
The typical sport that uses the term, "deuce", is Tennis or Table Tennis.
lawn tennis is a tennis
Rodney George Laver has written: 'Tennis for the bloody fun of it' -- subject(s): Tennis '228 tennis tips' -- subject(s): Tennis 'The education of a tennis player' -- subject(s): Tennis 'How to play championship tennis' -- subject(s): Tennis 'Tennis digest' -- subject(s): Tennis
Tennis in German is Tennis.
Grass tennis is tennis which is played on grass. A famous grass tennis arena is the Wimbledon.
une raquette de tennis (by the way, it's racquet in English)
"Tennis" in English is tennis in Italian.
it is associated with Tennis