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> Diet and exercise are almost identical.

What about everyday motions? At 50, I push myself gently up from my chair, while 25 year old coworkers leap up. They walk faster, they simply move with more energy through the day. Such things add up over the course of a day/week/month/year/decade.

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They do, and I've lived that. Sincere advice: force yourself to stand up without any assistance from your arms. I had a knee issue for a couple of years, and got into that very habit -- at first out of necessity. Before long it was required. It took about a month (!) to build back up the core strength to stand normally again.

Your core strength will decline quickly, and soon you will have to help yourself up all the time. Don't let the slide happen.

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