"The Point of Diminishing Return" We'd all be wize to learn with you that enuff is enuff and to learn to plan for it. Bailing is no disgrace when the body screams enuff. If we continue when our bodies tell us to stop we'll do more damage than the body can repair. Out of shape is one thing but when the hips, knees and other joints say stop we'd be fools to continue.
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...ask for the old paths, where is the good way, and walk therein... (Jeremiah)