Loved weed the first year I smoked it (especially listening to music), but it quickly lost its luster after that. I never touch the stuff now.
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About one's declining years, my dad is 57 and is in incredible shape. He works pretty hard at it though. He bikes, rows, lifts weights, and does a lot of cross-country skiing in the winter. His strength and stamina just kills me when I go out riding or skiing with him. Makes me glad to see him taking good care of himself, as I want him around as long as possible.
Funny how we know that exercising and eating right makes us feel great, but still we seem to always have to make ourselves do it. So easy to backslide.