Which of the following hobbies contribute to improving your physical fitness?
a. playing video games
b. watching tv
c. kayaking
d. stamp collecting

The answer is letter C.

Kayaking is a water recreational activity that involves mostly the movement of the upper body. This develops fitness in the body because of the demands of paddling and balancing on the water.  It is also included in competitive sporting events in different parts of the world. Other choices do not promote fitness as these activities involve little to no movements that require a lesser amount of physical exertion compared to kayaking.