http://healthfitness247.com/strength-training/ Strength training is an important part of an overall fitness program. Here's what strength training can do for you, it's the key to building muscle and it also helps you lose weight (and body fat) in a few different ways.First, it helps you retain the muscle you have while eating a calorie deficit and losing weight and also essential for maintaining your ability to live independently as you age, slows the aging process.