If everyone did Martha Beck's warm-up exercises, the world would be an altogether better place. Let's start with us.

I can't say I always enjoy cardiovascular exercise. I don't think anyone does. Oh, I've seen those infomercials featuring models whose granite abs and manic smiles become even more sharply defined at the very sight of workout equipment. But as we all know, these people are from Neptune. Being an Earth-human myself, I strongly resist abandoning my customary torpor to participate in perky physical activity of any kind. Nevertheless, I do cardio pretty regularly. I do it because I know my heart was designed to handle such challenges, because once I get started, I feel that it's doing me good, and because if I stop for very long, my health begins to atrophy.

There's another form of cardio that works much the same way, though it affects the emotional heart rather than the one made of auricles and ventricles. This workout consists of deliberately cultivating empathy. To empathize literally means "to suffer with," to share the pain of other beings so entirely that their agony becomes our own. I know this sounds like a terrific hobby for a masochistic moron, but hear me out.

The reason to develop a capacity for empathy, and then exercise it regularly, is that only a heart strengthened by this kind of understanding can effectively deliver the oxygen of the spirit: love.