How to build muscle as age tears it down

Photos: Fitness myth or fact?
Fitness: Myths vs. facts – Bad advice and outdated research could be putting a kink in your workout efforts. Here are some fitness myths that have proved to be just that.
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Photos: Fitness myth or fact?
Fitness: Myths vs. facts – Crunches do tone a small portion of your abs, but you may get better results from moves engaging your entire core.
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