Teigyr,
I was pretty lackadaisical about exercise until i read "Younger Next Year" .
The author says, exercise now so you can enjoy a healthier life later; and he recommends 45 minutes exercise minimum a day, for a minimum of 6 days a week!
and I have been following that regimen almost exactly since i finished reading his book about 2 months ago.

Lisa, I went up the stairs in 16 minutes and some seconds. I stopped twice to catch my breath and slow my heart rate, for about 5-10 seconds. There were people offering drinks, but you know, if you can't go 16 minutes without a drink, that's pathetic (imho) but when I got the top, I drank down a pint of water