Physical produced by the skeletal muscles and results in

Physical activity refers to any bodily
movement that is produced by the skeletal muscles and results in energy
expenditure that aims to maintain and improve physical fitness (Daskalopoulou, 2017).
Physical activity can be classified as structured or incidental. Structured
physical activity is planned, purposeful activity undertaken to promote health
and fitness benefits while incidental physical activity is not planned and
usually is the result of daily activities at work, at home, or during transport
(Strath et al., 2017). Based on  recent
studies, physical activity is associated with a reduction in obesity, weight
gain, coronary heart diseases (CHD), type II diabetes mellitus and the age-related
diseases of dementia and Alzheimer’s disease (Reiner et al., 2013). This may
lead to a good quality of life because of the lower risk of getting diseases. Physical
activity can be defines further into three dimensions which is frequency,
duration, and intensity. These three dimensions together constitute the amount
or the dose of physical activity performed (5).

Frequency refers
to how often the activity occurs and duration refers to time. For example how
long the activity lasts. According to World Health Organization (2010), the
intensity of physical activity refers to the rate at which the activity is
performed or the magnitude of the effort that is required to perform the
activity and is therefore important in relation to physical fitness. Hence,
moderate-intensity of physical activity requires a moderate amount of effort
and noticeably accelerates the heart rate such as brisk walking. Meanwhile
physical activity of vigorous-intensity requires a large amount of effort and
causes rapid breathing and a substantial increase in heart rate like running
(WHO, 2010).

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intensity is defined as relation to the metabolic rate of the body whereas one
metabolic equivalent (MET) is defined as the amount of oxygen consumed while
sitting at rest (Jette et al., 1990). Furthermore, relative intensity refers to
the level of effort required to do an activity while absolute intensity is the
amount of energy expended per minute of activity. According to (Physical Activity Guidelines
Advisory Committee, 2008), absolute intensity has been defined into
three intervals of metabolic rate which is <3 METs is for light-intensity physical activity, 3-5.9 METs for moderate-intensity physical activity and ?6 METs is equal to vigorous-intensity physical activity. In relation to public health guidelines for physical activity, the intensity is an important factor.