Daily Fit Tip: Know your numbers

Oprah's favorite medical guy Dr. Oz tells Reader's Digest (March 2008) about four lifesaving numbers we simply must know if we plan to say on top of our heart health. Do you know them? If not, you should.

• Blood pressure: It's a major driver of heart disease risk. The lower it is, the better off you are. In a perfect world, yours would be under 115/75 mm/Hg.
  
  

• Cholesterol: HDL is the important type and the higher the better on this one -- strive for over 40mg/dL. While LDL is less important, you should ideally keep it under 100 mg/dL.
  
  

• Blood sugar: Keep this one under 100 mg/dL too. If you can't maintain this, it's likely you'll acquire some form of diabetes.
  
  

• Waist size: Measure at the level of your belly button and make sure it's half your height or less. That's 33 inches if you're 5'6".