06/28/2009 05:12 am ET | Updated Nov 17, 2011

The Higher Intensity Your Workouts, The Better

About four years ago, it was suggested that Americans should exercise an hour a day and that the intensity level should be moderate to vigorous. The US Department of Health and Human Services has recently changed its tune and is suggesting reducing the total amount of time to 2 hours and 30 minutes a week of moderate-intensity or 1 hour and 15 minutes of vigorous-intensity aerobic exercise per week for adults.

What? Are you confused? I am and I teach this stuff.