Women who do strength training live longer. How much is enough?

Strength training is good for everyone, but women who train regularly get a significantly higher boost in longevity than men. (Gary Yeowell/Getty Images)

Resistance training does more than help us build strong muscles.

A new study finds women who do strength training exercises two to three days a week are more likely to live longer and have a lower risk of death from heart disease, compared to women who do none.