If a personal trainer has failed to get you in gear, adopt an Aries pet. These energetic little creatures will have you racing around all day: a guaranteed way to get in shape. Aries pets are playful, delightful and great with kids. If you're thinking about adopting a whole litter of critters, this pet may not be for you. Aries are the alphas of the zodiac, so they may be a bit scrappy and dominating when other animals come around. When they don't get their way, they may lash out with passive-aggressive behavior. (Chew a hole in the Persian rug AGAIN, Fido!?)