A smile is worth nothing, but it is valued dearly...
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For me, I exercise every morning. I exercise every day. I work out about an hour and 20 minutes, which is aerobics and resistance training. I work on agility and balance. I work on the things that are going to help my condition. I do agility training. I walk on a treadmill. I use an elliptical. I use weights.
I don't know how much thought is behind it, but it seems to me highly effective the way that Facebook will let somebody tag a photo with a friend's name, then others who are a friend of that friend can perhaps immediately see the photo, and the friend, in the meantime, has a chance to wander back and un-tag it.