Maintain the momentum
http://i.imgur.com/hPShgb3.png
https://www.youtube.com/watch?v=FoFa0iEkRos
http://youtu.be/8laJDzc0DI4
https://www.youtube.com/watch?v=PV3RBfvzA1Q
https://www.youtube.com/watch?v=2OOYtsCbUKA