This workout is designed to increase your muscle mass as much as possible in 6 weeks. Strength training is an important part of an overall fitness program. Want to reduce body fat, increase lean muscle mass and burn calories more efficiently? Strength training to the rescue! Strength training is a key component of overall health and fitness for everyone. Lean muscle mass naturally diminishes with age. Your body fat percentage will increase over time if you don't do anything to replace the lean muscle you lose over time. Strength training can help you preserve and enhance your muscle mass at any age.