Skeletal Muscle vs. Muscle Mass what's the difference?

I always got confused when it comes to skeletal muscle and muscle mass. Shouldn’t muscle be muscle?!

Simply put: skeletal muscle is “trainable”

When you talk about gaining muscle you are talking about the growth of skeletal muscle which is attached to your bones.

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Muscle mass includes every single muscle in your body: skeletal, cardiac, and smooth muscle

Both are fun measurements to look at but when we talk about muscle gain we want to focus on the skeletal muscle % in relation to your body weight.