as our muscles grow and bones get stronger, it increases flexibility and more sunuviul fluid and you get more cartilidge and increase lung capacity and have more red blood cells.
the amount of exerise you do makes the body fitter so it needs to be able to keep up with its self and your heart gets stronger and pumps more blood in one beat and this is called stroke volume.
with bone density the out side of the bone is called the compact bone.
also the bones get stronger to cope with stress and all the stess you put threw them, also it helps you maintain health.
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