Question

Define flexibility and coordination, and explain the role that each plays in your favorite sport or physical activity.

Answer 1

Answer:

Flexibility: Moving easily without breaking  

Coordination: the ability to use different parts of the body together smoothly and efficiently.

These two contribute to tennis because in order to move quickly and effectively you have to have flexibility. In tennis, coordination is also important because without coordination you wouldn't be able to react quick and efficient enough to make the point

Answer 2

Flexibility: the quality of bending easily without breaking (is the actual definition) 
coordination: the organization of the different elements of a complex body or activity so as to enable them to work together effectively (actual definition) 
and depending on your sport it could help you do it more gracefully