Reconstructed CT images of the humeri of a professional baseball player reveal a bigger bone in the throwing arm than in the nonthrowing arm when the bone is viewed from the front (left). Cross-sectional images (right) displayed greater
Image courtesy of Stuart Warden

How to Bulk Up Your Bones

Working out in your younger years doesn’t just have short-term benefits such as weight control and energy boosts; it can also benefit your bones in the long run. Researchers studying the throwing arm of major and minor league baseball players during their careers found that those who completely stopped playing after they retired retained 34% of their humerus—or upper arm—bone strength and 56% of its size. The study, published today in the Proceedings of the National Academy of Sciences, found that those who continued working out after retirement retained even more benefits, like increased bone mass.

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