Physical activity
Any form of movement that causes your body to use energy
Physical fitness
The ability to carry out daily tasks easily and have enough reserve energy to respond to unexpected demands
Exercise
Purposeful physical activity that is planned, structured, and repetitive, and that improves or maintains physical fitness
Sedentary
Involving little physical activity
Cardiorespiratory endurance
The ability of your heart, lungs, and blood vessels to send fuel and oxygen to your tissues during long periods of moderate to vigorous activity
Muscular strength
The amount of force your muscles can exert
Muscular endurance
The ability of your muscles to perform physical tasks over a period of time without tiring
Flexibility
The ability to move your body parts through their full range of motion
Aerobic exercise
Includes all rhythmic activities that use large muscle groups for an extended period of time
Anaerobic exercise
Involves intense, short bursts of activity in which the muscles work so hard that they produce energy without using oxygen
Specificity
Choosing the right types of activities to improve a given element of fitness
Overload
Exercising at a level that's beyond your regular daily activities
Progression
Gradually increasing the demands on your body
Warm-up
Gentle cardiovascular activity that prepares the muscles for work
Workout
The part of an exercise session when you are exercising at your highest peak
Cool-down
Low-level activity that prepares your body to return to a resting state
Resting heart rate
The number of times your heart beats per minute when you are not active
Frostbite
Damage to the skin and tissues caused by extreme cold
Hypothermia
Dangerously low body temperature
Overexertion
Overworking the body
Heat exhaustion
A form of physical stress on the body caused by overheating
Heatstroke
A dangerous condition in which the body loses its ability to cool itself through perspiration
Muscle cramps
Sudden and sometimes painful contractions of the muscles
Strains
Result from over-stretching and tearing a muscle
Sprains
Injuries to the ligaments around a joint