Physical Activity, Fitness, and the Built Environment: Foundations for Personal Health

Physical Fitness and Physical Activity

Definitions and Key Concepts

Understanding the distinction between physical activity, exercise, and physical fitness is essential for personal health. These concepts form the foundation for developing and maintaining a healthy lifestyle.

• Physical Activity: Any bodily movement produced by skeletal muscles that results in energy expenditure above resting levels. Examples include walking, gardening, and household chores.

• Exercise: A subset of physical activity that is planned, structured, and repetitive, with the objective of improving or maintaining physical fitness.

• Physical Fitness: The body’s ability to respond or adapt to the demands and stress of physical effort. It encompasses several components that contribute to overall health and performance.

Key Point: All exercise is physical activity, but not all physical activity qualifies as exercise.

Components of Physical Fitness

Health-Related Components

Health-related components of fitness are directly associated with overall health and reduced risk of chronic disease. These components are essential for everyone, regardless of athletic ability.

• Cardiovascular Fitness: The ability of the heart, lungs, and blood vessels to supply oxygen to working muscles efficiently during sustained physical activity.

• Muscular Strength: The maximum amount of force a muscle or muscle group can exert against resistance.

• Muscular Endurance: The ability of a muscle or group of muscles to sustain repeated contractions against resistance for an extended period.

• Flexibility: The range of motion available at a joint.

• Body Composition: The relative amounts of muscle, fat, bone, and other vital parts of the body.

Component	Definition	Example
Body composition	The percentage of body weight which is fat, muscle, and bone	The gymnast has a lean body composition to allow them to propel themself through the air when performing on the asymmetrical bars
Cardiovascular fitness	The ability of the heart, lungs, and blood to transport oxygen	Completing a half marathon with consistent split times across all parts of the run
Flexibility	The range of motion (ROM) at a joint	A gymnast training to increase hip mobility to improve the quality of their split leap on the beam
Muscular endurance	The ability to use voluntary muscles repeatedly without tiring	A rower repeatedly pulling their oar against the water to propel the boat towards the line
Strength	The amount of force a muscle can exert against a resistance	Pushing with all one’s force in a rugby scrum against the resistance of the opposition pack

Skill-Related Components

Skill-related components of fitness are more closely associated with athletic performance and include abilities that enhance one's capacity to perform in sports and physical activities.

• Agility: The ability to change the position of the body quickly and control movement.

• Balance: The ability to maintain the body’s center of mass above the base of support.

• Coordination: The ability to use two or more body parts together smoothly and efficiently.

• Power: The ability to perform strength performances quickly (a combination of strength and speed).

• Reaction Time: The time taken to respond to a stimulus.

• Speed: The ability to put body parts into motion quickly.

Component	Definition	Example
Agility	The ability to change the position of the body quickly and control movement	A badminton player moving around the court from back to front and side to side at high speed and efficiency
Balance	The ability to maintain the body’s centre of mass above the base of support	A sprinter holds a perfectly still sprint start position and is ready to go into action as soon as the gun sounds
Coordination	The ability to use two or more body parts together	A trampolinist timing their arm and leg movements to perform the perfect tuck somersault
Power	The ability to perform strength performances quickly	A javelin thrower applies great force to the spear while moving their arm rapidly forward
Reaction time	The time taken to respond to a stimulus	A boxer perceives a punch from their left and rapidly moves their head to avoid being struck
Speed	The ability to put body parts into motion quickly	A tennis player moving forward from the baseline quickly to reach a drop shot close to the net

Body Composition: Models and Measurement

Understanding Body Composition

Body composition refers to the proportion of fat and non-fat mass in the body. It is a more accurate indicator of health than body weight alone, as it distinguishes between fat mass and lean mass (muscle, bone, organs, etc.).

• Fat Mass: Stored fat (adipose tissue) used for energy, insulation, and organ protection.

• Non-Fat Mass: Includes essential fat (in organs and tissues), muscle, bone, and other tissues.

Common methods for measuring body composition include skinfold calipers, underwater weighing, air displacement plethysmography, DEXA scans, and bioelectrical impedance analysis.

Example: The four-compartment model divides the body into fat mass, total body water, protein, and mineral content for a more precise assessment.

Benefits of Physical Activity and Exercise

Wellness Benefits

Regular physical activity and exercise provide numerous benefits for physical, psychological, and social health. These benefits increase with the frequency and intensity of activity, but excessive exercise can suppress immune function.

• Improved cardiorespiratory functioning

• Better body composition

• Disease prevention and management (e.g., cardiovascular disease, diabetes)

• Enhanced psychological and emotional wellness

• Improved immune function

• Prevention of injuries and low back pain

Example: Moderate exercise is associated with a lower risk of upper respiratory tract infections (URTI), while very high levels of exercise may increase risk.

Guidelines for Physical Activity

Canadian 24-Hour Movement Guidelines

The Canadian 24-Hour Movement Guidelines integrate recommendations for physical activity, sedentary behavior, and sleep for different age groups. These guidelines emphasize the importance of moving more, reducing sedentary time, and sleeping well for optimal health.

• Children and youth (5-17 years): At least 60 minutes of moderate-to-vigorous physical activity daily.

• Adults (18-64 years): At least 150 minutes of moderate-to-vigorous aerobic activity per week, in bouts of 10 minutes or more.

• Older adults (65+ years): Same as adults, with added focus on balance and strength activities.

Classifying Levels of Activity

Physical activity can be classified by intensity:

• Light Activity: Minimal effort, such as slow walking or light household chores.

• Moderate Activity: Noticeable increase in heart rate and breathing (e.g., brisk walking, cycling).

• Vigorous Activity: Substantial increase in heart rate and breathing (e.g., running, fast cycling).

Intensity	Definition	Examples
Moderate	3.0-5.9 times the intensity of rest for adults; 40-60% of maximal effort	Brisk walking, cycling, household chores, recreational swimming
Vigorous	6.0 or more times the intensity of rest for adults; 70-89% of maximal effort	Running, fast cycling, competitive sports, vigorous dancing

Principles of Physical Training

Key Principles

Effective physical training programs are based on several foundational principles:

• Progressive Overload: Gradually increasing the demands on the body to stimulate adaptation and improvement.

• Reversibility: Fitness gains are lost when physical activity is reduced or stopped.

• Rest/Recuperation: Adequate recovery time is necessary to allow the body to heal and adapt, preventing overtraining.

• Specificity: Training should be tailored to the desired outcome (e.g., cardiovascular endurance, muscular strength).

Example: To improve cardiovascular fitness, one should engage in aerobic activities such as running or swimming, rather than focusing solely on weightlifting.

Planning for Personal Fitness

Setting Goals and Overcoming Barriers

Developing a personal fitness plan involves identifying individual goals, incorporating both physical activity and exercise, and applying behavior change strategies.

• Set S.M.A.R.T. goals: Specific, Measurable, Achievable, Realistic, and Time-based.

• Start slowly and progress gradually.

• Plan ahead to overcome obstacles and maintain motivation.

• Apply theories of health behavior change to support long-term adherence.

Physical Activity and the Built Environment

Influence of the Built Environment

The built environment encompasses the physical surroundings in which people live, work, and play. It significantly influences opportunities for physical activity through factors such as density, diversity, and design.

• Density: Walkable neighborhoods with close proximity to destinations encourage walking and transit use.

• Diversity: Mixed land use (homes, schools, shops, services) supports active transportation and higher physical activity levels.

• Design: Interconnected street networks, safe sidewalks, and accessible community spaces promote walking and reduce reliance on automobiles.

Automobile-oriented environments can marginalize vulnerable populations and exacerbate health disparities. Universal access to parks, recreational facilities, and public transportation is essential for promoting physical activity for all.

Summary Table: Health-Related vs. Skill-Related Fitness Components

Health-Related Components	Skill-Related Components
Cardiovascular fitness Muscular strength Muscular endurance Flexibility Body composition	Agility Balance Coordination Power Reaction time Speed

Additional info: These notes integrate foundational concepts from exercise science and public health, providing a comprehensive overview suitable for personal-health college students preparing for exams or practical application.