Table 1.

– Definition of physical exercise-related terms.

Terms	Definitions
Physical activity	Any bodily movement generated by skeletal muscles which results in energy expenditure above resting levels [1,27]
Physical exercise	Planned, structured, and repetitive bodily movement performed in order to improve and/or maintain one or more components of physical fitness [1,27]
Physical fitness	A set of attributes that are either health- or skill-related. The degree to which these attributes can be measured by specific tests as stated in [27]
Physical function	Capacity of an individual to carry out physical activities. It is a direct reflection of motor function and control. Physical fitness and habitual physical activity are independent predictors of functional independence, disability, morbidity, and mortality [1]
Physical inactivity	State in which bodily movements are minimal and energy expenditure approximates the resting metabolic rate [29]
Sedentary behavior	Activity that involves little or no movement or physical activity, characterized by energy expenditure ≤1.5 METa, e.g., in a sitting, reclining, or lying posture [1]

^aMET: metabolic equivalent of task (index of energy expenditure; 1 MET = 3.5 mL oxygen/kg/min uptake).