The document discusses strength training and its benefits. It defines strength training as a program designed to improve muscular strength and/or endurance through progressive overload exercises. Strength training provides benefits such as improved performance in daily activities, decreased risk of diabetes, and improved posture. For older adults, strength may be the most important component of fitness to prevent sarcopenia, which is the age-related loss of muscle mass and strength. The principles of strength training include mode of exercise, resistance used, sets, frequency, and volume of training. Factors that affect strength include neural stimulation, muscle fiber types, overload principle, and specificity of training.