Sometimes customizing is necessary because of an injury or the inability to do, for a short or long period, the kind of exercise you formerly did. When you're used to customizing for fun, doing it under duress won't seem like such an imposition. Either way, experiment until you find activities that make you happy as well as healthy. Choose your exercise using the same criteria you'd apply to choosing a date--that is, attractive to you and able to hold your interest for an hour.

I have to strive to go two steps forward and realize that, sometimes, there will be one step back.

I'm a big believer in living life as an extended working vacation.

That old saying about opportunity only knocking once is as archaic as the flat-earth theory and as patently untrue. Opportunity knocks all the time - and it rings your doorbell, calls you up, and sends you e-mails.

The idea that somebody else is going to swoop down and play the fairy godmother role is pretty unlikely, so why not take care of yourself?

In terms of days and moments lived, you'll never again be as young as you are right now, so spend this day, the youth of your future, in a way that deflects regret. Invest in yourself. Have some fun. Do something important. Love somebody extra. In one sense, you're just a kid, but a kid with enough years on her to know that every day is priceless.

The strongest animals on earth are plant eaters. Every creature we've enlisted to do the work we couldn't handle - the horse, donkey, elephant, camel, water buffalo, ox, yak - is an herbivore... whose huge muscles were built from plant protein, and whose strong bones got that way, and stayed that way, from grazing on grass and eating other vegetables.