The Inside Story (Part One) How Does Exercise Affect My Bones?

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Like skin, bone renews itself constantly and old bone is replaced by new. This remodelling and renewing is triggered by factors such as exercise, inactivity, diet, hormones and even the Earth's gravity.

Within limits, the strength and shape of our bones is determined by the stresses they undergo. For example someone who carries heavy loads or exercises regularly will have thicker and stronger bones.

Bones are living tissues and are continuously growing and being replaced with new bone. This new bone being laid down more in places where the bones are under the most stress such as the legs and spine of a runner.

At any given time 5% of your total bone mass in the body is being remodelled. By the age of 20, the average young adult will acquire roughly 98% of his or her total bone mass. This percentage is crucial as at this age it will be the highest it will be in their life time.