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Kallie wants to improve her tennis serve. she already practices every day the court is available, and her technique and energy output are outstanding. kallie should focus on a) frequency; performing more cardio-related workouts b) intensity; increasing the effort expended during her workout c) time; increasing the length of her workout d)type; performing a different activity to achieve her goal
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Kallie wants to improve her tennis serve. she already practices every day the court is available, an...
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