When you weigh yourself, the scale cannot differentiate between muscle, fat, water, bone or internal organs. In fact, a scale doesn't know if you are human being or a bag of rice. If you have recent weight gain, it's important to know if it's muscle or fat.
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The connection between muscle gain and weight loss is probably one of the most misunderstood aspects of health and fitness. Adding muscle to your body helps you to lower your body fat percentage in a variety of ways; however, these effects are often indirect and can be confusing.
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Most long distance runners have very little body fat, but they also have very little muscle. During long distance runs, some of your muscle is metabolized for energy. On the other hand, interval running allows you to burn a significant number of calories without sacrificing your muscle mass.
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The lumbar part of your spine is your low back, and it consists of five vertebrae which are referred to as L1 through L5. The discs between these vertebrae act as shock absorbers, and they also bear a significant amount of your weight.
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