<span>While you may be able to determine </span>your<span> exact </span>body fat percentage<span>, ... to 40 </span>percent<span>of</span><span> a healthy person's </span>body mass<span> is made </span>up<span> of skeletal </span>muscle<span>. ... and type of activity </span>make<span> a difference in </span>muscle<span> mass, with bodybuilders ...</span>
