You read that right. Just 4 seconds of intense physical activity is enough to keep your body healthy. Seems too good to be true, right?!

Well, one of our favorite writers & HER regulars is back on the show to tell us more. Gretchen Reynolds writes the popular "Phys Ed" column for The New York Times, which posts online as part of the "Well" blog and also appears in the print edition of the paper's "Science Times." The column regularly is among the week's most emailed stories and several columns have been among the most viewed and most emailed stories of the year at nytimes.com.

She joins us to talk about her latest NYT piece, "Exercise Vigorously for 4 Seconds. Repeat. Your Muscles May Thank You," using exercise as a coping tool, HIIT, and how you can get a meaningful workout in a short time period.