December 14, 2015

Welcome to I'm Obsessed, a daily video series with Kahlana Barfield, InStyle's fashion and beauty editor at large. Check back every weekday to learn more about the beauty products and tools she can't get enough of.

When the trainer behind Jennifer Lopez’s killer physique delivers easy-to-follow tips for leading a healthier life, we listen. That’s why David Kirsch’s Ultimate Family Wellness guide has become our go-to source for five-minute workout fixes and delicious, yet efficient, fat-burning meals. After all, the man’s also previously worked with stars like Julia Roberts, Kerry Washington, and Anne Hathaway, so believe that his 5-5-5 exercise and nutrition philosophy (follow it and lose five pounds in five days) is definitely one to note. 

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Shop it: $23; quartoknows.com.

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Watch the video above to learn why Barfield loves it—and visit instyle.com/videos for more of our obsessions.