Today's Free App of the Day is Move It!
Eight of eleven reviews are four stars and above. Only one seemed to be from the developer. One one-star talked about permissions. One talked about developer reviews (though I could only see one obvious one) and the pressure of having the number of moves to get to goal counted.
These apps are compatible with the original Fire and with the Fire 4G. To tell if an app works for your Fire HD or other Android device registered to your Amazon account, click on the above link and look on the right side of the web page. Amazon will tell you if it will work with your registered device.