It's 100% the tennis ! In tennis you always keep active while you concentrate on the ball and the ball is pretty fast you can't stop moving until you win the round or loose the round.For example in football you can stop running if the ball isn't with you and even there is subtitution...So tennis is more active than swimming because swimming you relax in water which you are fast,while tennis you keep running right side and left side so the most active sports is tennis...
Hope I helped !
Ali Fares,
From Lebanon
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