Aging is a natural, physiological, and inevitable process, but it can be also influenced. Although aging is not a disease, it has several characteristics that could indicate so, such as a functional decline at different levels, which may determine clinical manifestations, and it is associated with several disease processes. Consequently, it is essential to create and adopt strategies to delay the aging process. Nowadays, any strategy adopted without including physical exercise seems

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... e. Recent studies published in relation to this population have shown that the maintenance of acceptable levels of physical fitness is associated with the prevention of many of premature aging consequences, good rates of health, and quality of life of the person. cardiorespiratory fitness and muscular strength (as physical fitness components) are excellent life expectancy and quality of life predictors. Therefore, reaching a good fitness level is the most powerful clinical method to prevent and delay the aging process. Not only their years to live increase, but also their quality, with health and without diseases or mobility dependence. Cardiorespiratory fitness as a health predictor Cardiorespiratory fitness is the most important component of physical fitness, and maximum oxygen uptake (VO 2 max) is the physiological variable which has defined it both traditionally [7] and nowadays [8] . The VO 2 max can be measured with indirect calorimetry J o u rn al of G e r o n to lo gy & G e r ia tr ic Resea rc h