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I am also 47 years old. A few years ago I used to run 10-15 km 2-3 x a week and do no other form of training. After reading the book "Your New Prime" by Craig Cooper I became convinced that was stupid for a man in his 40s. From the 40s and onwards one tends to really loose strength. This may not become an acute problem before in ones 50s or 60s. ...


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