Physical fitness is defined as having the ability to perform physical activity and is measured by five components: cardiorespiratory fitness, muscular strength, muscular endurance, body composition, and flexibility. Maintaining physical fitness can help prevent diseases, change body composition without changing weight, and ease medical complaints through increased flexibility. The human body has many muscles that can be strengthened through different types of exercise to improve overall fitness.

1. FITNESS

2. What does being physically fit
mean?
– According to the United States Department of Health and Human Services,
physical fitness is defined as "a set of attributes that people have or achieve
that relates to the ability to perform physical activity."

3. Fast facts on fitness:
– Maintaining physical fitness can help prevent some diseases.
– With exercise, body composition can change without changing weight.
– Athletes' hearts show different changes dependent on their chosen sport.
– Muscle strength increases by fiber hypertrophy and neural changes.
– Stretching to increase flexibility can ease a number of medical complaints.

4. components
– cardiorespiratory fitness
– muscular strength
– muscular endurance
– body composition
– flexibility.

11. FACTS ABOUT FITNESS
– The human body has 650 muscles.[1]
– The only exercise you should hold your breath for is underwater swimming.[2]
– The heart is the strongest muscle in the body.[3]
– Nearly 50% of all young people ages 12-21 are not vigorously active on a daily
basis.[4]
– For every pound of muscle gained, the body burns 50 extra calories every day.[5]
– Only 13% of men are physically fit.[6]