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 select one: 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

Kallie should focus on the type; performing a different activity to achieve her goal (Option D)

Explanation: As Kallie is already giving a lot of time in practicing and her technique and energy output are outstanding, so her frequency, intensity and time in the FITT cycle are being completed.

She should focus on the type of activity she is performing. She should change it and see if it would make her tennis serve better.  

no, because those are both different running competitions. while distance runners train their legs and their lungs to run long amounts of time, the sprinters are training their legs and their lungs to give all they have in the little amount of area they need to cover. the brain also plays a huge part in all of this.

the brain is the only thing in your body that sends messages to your body telling you to run. if you are a long distance runner and you have the mind set of a sprinter, you will not get anywhere. if you have a long distance mind set and you have to run 200m in 20 seconds then you will not make it in time.