Fat hangs and wobbles. Muscle is tight and hard. You can get a BMI chart from either your doctor or on line. It will ask you a few numbers about yourself and you got to divide and multiply and you will come out with your BODY MASS INDEX which measures the percentage of fat on your body.
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Well there are many ways. Keep track of your weight and strength against one another. You don't need to be losing or gaining weight to gain muscle. If your weight is staying consistent, and your able to max-out with more weight on various upper and lower body exercises, you can be sure that you are gaining muscle mass. You can also get your body fat tested and measure it against your weight gain or loss, if body fat percentage lowers over time, and weight stays roughly the same, you know you have gained muscle mass and lost fat content. Hope this helps some.