The purpose of the study was to examine the impact of a low-intensity aerobic fitness program on the chosen physiological and biochemical markers of kidney activity, the parameters of physical fitness in physically active elderly men of 55 60 years. A one-group pretest- posttest design was used as the experimental method. The sample was chosen as 12 physically active elderly men, who were carefully chosen out of elderly population of Misan Governorate in Iraq. The training had a duration of 12 weeks and it had four sessions in a week. It was composed of walking workouts, stationary bicycle, and bodyweight trainings whereby intensity and duration were increased gradually. Physiological measurements were done in heart rate and systolic and diastolic blood pressure. Measures of physical fitness included cardiorespiratory endurance, muscular endurance and body mass index (BMI). The findings showed statistically significant differences in the post-test measures in favor of most variables, which means that the training program is effective in improving the functioning of kidney and blood pressure regulation as well as physical fitness in general. The research suggests the implementation of such low-intensity aerobic exercises programs as one of the safe and effective preventive measures aimed at maintaining physiological health among older adults.