What is the effect of muscle strength training on body composition?

Muscle strength training leads to an increase in lean muscle mass, which is the correct outcome of engaging in such exercise. When individuals participate in strength training, their muscles undergo hypertrophy, which is the process of muscle fibers increasing in size. This adaptation occurs in response to the stresses placed on the muscles during resistance exercises.

As muscle mass increases, it can significantly influence overall body composition. Lean muscle tissue plays a critical role in metabolism; it is more metabolically active compared to fat tissue. This means that individuals with greater muscle mass typically have a higher resting metabolic rate, which can assist in reducing body fat percentage over time, even in the absence of caloric restriction. Furthermore, increased lean muscle mass can lead to improved strength, endurance, and overall functional capacity, further promoting an active lifestyle.

The overall shift in body composition toward a higher proportion of lean muscle mass and a lower proportion of body fat is a primary goal of strength training, which is why this option is recognized as the correct answer.