60 minutes of exercise per day needed for middle-aged women to maintain weight

Although I'm not terribly fond of the term "middle-aged", it is in fact where I am in my lifespan.  Yikes.  

One of my clients mentioned this Harvard study (link below) that debunks the following exercise rules we have heard for years:

The 150 minutes a week of moderate-intensity physical activity, which can be achieved by 30 minutes a day, five days a week, and which is recommended by the federal government, while clearly sufficient based on data from many studies to lower the risk of developing chronic diseases, is insufficient for weight-gain prevention, without restricting caloric intake.

We need 60 minutes a day folks!

http://news.harvard.edu/gazette/story/2010/03/60-minutes-of-exercise-per-day-needed-for-middle-aged-women-to-maintain-weight/