We all know that exercise helps protect grown women against breast cancer, but according to CNN, new research has found that exercise during the teen years – starting as young as age 12 – can help protect girls from breast cancer when they are grown.
The best results, they say, are when the girl does regular exercise from ages 12 to 22 because it lowers her estrogen levels overall. What's more? Exercising early can also help reduce a girl's risk of obesity and increase her self esteem. If you're already over 22 and have been sedentary most of your life, don't worry: Starting exercise at any point helps your overall health significantly.