Is it possible to go too hard and too long when you're working out? Sure enough, says Love+Blueberries expert Dr. Natasha Turner, author of "The Hormone Diet," who weighs in on how more exercise isn't always better.

Turner often sees women doing too much cardio exercise, like running five days a week for up to an hour. You don't need to work out for an hour straight, says Turner, because unless you're a very conditioned athlete, after 40 minutes of exercise, your stress hormones will start to rise -- and this tears down your muscles. Going shorter is key -- and so is strength training.