"It doesn't take a lot. You don't have to be super intense, like a triathlon or an Alcatraz swim," said Dr. Moshe Lewis, a California Pacific Medical Center physician who specializes in pain management and sports medicine. "Only 15 minutes a day, that's not much. It's great for people to know that walking around, doing some stairs, that's getting a cardiac regimen going."

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"It doesn't take a lot. You don't have to be super intense, like a triathlon or an Alcatraz swim," said Dr. Moshe Lewis, a California Pacific Medical Center physician who specializes in pain management and sports medicine. "Only 15 minutes a day, that's not much. It's great for people to know that walking around, doing some stairs, that's getting a cardiac regimen going."

Read the article

I think a woman who ran a complete marathon while 9 months pregnant is bonkers. She endangered her child, as the kid will be adverse to running his entire life.

My thought was more along the lines of a fifteen-minute walk every day, not that we all go get preggers and run a marathon.

Although I certainly admire your enthusiasm.

I do 20 minutes on the treadmill several times a week. It has been too hot here for a walk,except at 5:30 am when the dogs go out. Earlier this year I developed Runners Knees (chondramalaycia sp?)after years of jogging as a younger man. It hurts like hell until you get the artificial cartilage stuff injected. It can make a man downright grouchy.