Level
Some fingers are more difficult than others. It's a good idea to train them all.
The video shows you how to hold your hand playing the piano. Your hand hangs a little above the keys. Your fingers just do what's necessary, and that's actually not very much! You'll notice that some fingers are more difficult than others. Try to keep your hand relaxed even when playing with difficult fingers.
When you play 5 white keys in a row a few times, your fingers will get used to it, and you'll be able to keep your hand relaxed even when playing difficult songs. In time you'll learn to use your fingers evenly. The video starts on a C, but it is more fun to choose a different key to start with every day.