REVS FAT BURN: A quick stroll

Flexibility, endurance and heart function reach their peak in the early evening, making exercise feel easiest at this time, say Stanford scientists. It’s also the time when motion is most likely to spike levels of human growth hormone—a compound that keeps you energized and prods the formation of metabolism-boosting muscle tissue. Carve out 20 minutes for a brisk walk and research from Northwestern University shows you’ll boost your energy and rev fat burn by as much as 20 percent.