Question

Tennis requires its players to have cardio-respiratory strength. a. True b. False

Answer 1

Tennis requires its players to have cardio-respiratory strength, so they won't feel so weak when playing tennis, and their lungs and heart can keep up with each other.  

Answer 2

A. True
Cardio respiratory strength makes your heart and your lungs strong, that tennis players need because they run around a lot. 
Hope this helps :)