No more excuses, now get walking

Enough with your I'm-too-busy-to-exercise excuse. Twenty minutes on most days of the week is all you need. You've got that, right? If you don't have it all in one chunk, surely you have a few minutes here and there. Use them when you find them and by the end of the day, you'll have 20 under your belt.

I'm not talking anything too taxing or strenuous here, just 20 minutes of walking. Yes, walking. Here, thanks to the Today Show, a few guiding principles for hitting the road and getting the most from the minutes you've got.