UNLOCK YOUR H.E.A.R.T.! Join Chloe and her puppy, Margot, on a journey to discover the three keys that open the lock to a heart-healthy life. H.E.A.R.T. is an acronym for Healthy Eating, Aerobics, and Reduce Tension--big words for most kids. Keys to Your H.E.A.R.T. takes a whimsical approach to help children understand these big words, along with simple things kids can do to help make their hearts healthier and happier.