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Unlike lean muscle, Lean Body Mass correctly uses the word “lean” as it describes the entire weight of your body minus fat. This is why it is also known as “Fat-Free Mass.” Because your Lean Body Mass comprises so many parts, any change in the weight of these areas can be recorded as changes in LBM.
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Your lean body mass is the amount of weight you carry on your body that isn’t fat. The goal of any bodybuilder or fitness enthusiast is to drop weight while keeping your lean body mass the same, in other words, dropping your body fat percentage. To find your lean body mass, you must first know your body fat percentage.
Lean body mass plus body fat equals body weight The percentage of total body mass that is lean is usually not quoted – it would typically be 60–90%. Instead, the body fat percentage , which is the complement, is computed, and is typically 10–40%.
Even though measuring the lean-to-fat ratio is tricky (your body composition constantly changes), and comparing ratios over time is only relevant if the weigh-ins are made in the same conditions, it is still a good indicator of how healthy your weight is. It basically tells you if you have an unhealthy level of fat.
so if your total weight is 57kg and your body fat percentage is 12%, that means you have 6.8kg of fat, and around 50kg of lean body mass, which is everything in your body besides fat: blood, bones, muscle, organs, etc. FYI, about 43% of your body weight is skeletal muscle.
Supplementing with Xtend both during your workout and during the rest of the day increases protein synthesis, decreases protein breakdown, increases blood flow and muscle fullness, and increases fat oxidation and energy; your body becomes a fat-burning, muscle-building machine.
Body Shape-Similar to body fat distribution is we all have different body shapes, so two different body shapes may have the same body fat percentage even if they don’t look like it. A classic example is a skinny runway model may have the same body fat percentage as a fit, athletic women.
These body fat levels are in the body building contestant range which if the body builder is in shape will be extremely lean and vascular (veiny). This is a very low body fat range and very difficult to maintain since the nutritent intake is extremely low.