Rest, eat, train. Swim, bike, run!
Physical fitness is comprised of two concepts: general fitness (a state of health and well-being) and specific fitness (the ability to perform aspects of sports/occupations). Both are achieved through exercise, good nutrition and adequate rest.
Health is the general condition of a person in all aspects. It is also a level of functional and/or metabolic efficiency of an organism, often implicitly human. "The state of being free from illness or injury".
Wellness includes not only wealth and employment, but also an individual's environment, physical health, mental health, education, recreation/leisure time, and social belonging.