According to the Centers for Disease Control and Prevention (CDC), physical fitness is defined as 'the ability to carry out daily tasks with vigor and alertness, without undue fatigue, and with ample energy to enjoy leisure-time pursuits and respond to emergencies.' Based on this definition, fitness involves everything from getting out of bed to hiking to performing CPR.
Components of Fitness
Depending on the source, the components of fitness vary considerably. Below are common components.
Cardio respiratory endurance - typically measured by how long or fast a person can perform an activity and how this impacts measurements such as heart rate and oxygen consumption.
Muscular endurance - typically measured by how many repetitions of an exercise a person can perform. Common tests involve push-ups and sit ups.
Muscular strength - typically measured by how much weight can be moved in relation to repetitions. Exercises involving multiple joints and muscle groups such as squats or bench press are often used.
Muscular power - typically measured by how much force can be generated during a given activity.
Flexibility - typically measured by how far a muscle group can be stretched or joint can be moved. The most common tests involve the hamstrings and shoulders.
Balance - typically measured by how long a particular position can be held with or without some type of activity being performed. Simple tests such as standing on one leg can be used to assess balance.
Speed - typically measured by how quickly an individual can move from one point to another.
Body composition - this is the amount of fat on the body versus other tissues such as muscle, bones and skin.
- Ectomorph: Lean and long, with difficulty building muscle
- Endomorph: Big, high body fat, often pear-shaped, with a high tendency to store body fat
- Mesomorph: Muscular and well-built, with a high metabolism and responsive muscle cell
Heart Rate
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats per minute.
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