Everyone seems to agree that strength is a good thing. Sports trainers claim that increasing your strength will allow you to run faster, jump higher, hit harder. Physical therapists will tell you that increasing strength in a certain muscle will cure back pain, knee pain, and hip pain.

Regardless of whether or not these claims have any merit, one thing I find interesting is that hardly anyone ever defines what they mean by strength. And that’s probably because it can be a very elusive concept to pin down...

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